Condensed cyclic compound and organic light-emitting device including the same

ABSTRACT

A condensed cyclic compound represented by Formula 1: 
     
       
         
         
             
             
         
       
     
     wherein in Formula 1, groups L 1  and X 1  to X 16  are the same as described in the specification.

CROSS-REFERENCE TO RELATED APPLICATION

This application claims priority to Korean Patent Application No. 10-2014-0129513, filed on Sep. 26, 2014, in the Korean Intellectual Property Office, and all the benefits accruing therefrom under 35 U.S.C. §119, the content of which is incorporated herein in its entirety by reference.

BACKGROUND

1. Field

One or more embodiments relate to a condensed cyclic compound and an organic light-emitting device including the same.

2. Description of the Related Art

Organic light emitting devices (OLEDs) are self-emission devices that have wide viewing angles, high contrast ratios, and short response times. In addition, OLEDs exhibit excellent brightness, driving voltage, and response speed characteristics, and produce full-color images.

In an example, an organic light-emitting device includes an anode, a cathode, and an organic layer that is disposed between the anode and the cathode and includes an emission layer. A hole transport region may be disposed between the anode and the emission layer, and an electron transport region may be disposed between the emission layer and the cathode. Holes provided from the anode may move toward the emission layer through the hole transport region, and electrons provided from the cathode may move toward the emission layer through the electron transport region. Carriers, such as holes and electrons, are recombined in the emission layer to produce excitons. These excitons change from an excited state to a ground state, thereby generating light.

Various types of organic light emitting devices are known. However, there still remains a need in OLEDs having low driving voltage, high efficiency, high brightness, and long lifespan.

SUMMARY

One or more embodiments relate to a condensed cyclic compound and an organic light-emitting device including the same.

Additional aspects will be set forth in part in the description which follows and, in part, will be apparent from the description, or may be learned by practice of the presented exemplary embodiments.

An aspect of embodiments provides a condensed cyclic compound represented by Formula 1:

wherein in Formula 1,

L₁ is selected from a phenylene group, a pyridinylene group, a pyrimidinylene group, and a triazinylene group;

X₁ is N or CR₁;

X₂ is N or CR₂;

X₃ is N or CR₃;

X₄ is N or CR₄;

X₅ is N or CR₅;

X₆ is N or CR₆;

X₇ is N or CR₇;

X₈ is N or CR₈;

X₉ is N or CR₉;

X₁₀ is N or CR₁₀;

X₁₁ is N or CR₁₁;

X₁₂ is N or CR₁₂;

X₁₃ is N or CR₁₃;

X₁₄ is N or CR₁₄;

X₁₅ is N or CR₁₅;

X₁₆ is N or CR₁₆;

R₁ to R₁₆ is each independently selected from R_(ET), a hydrogen, a deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitro group, an amino group, an amidino group, a hydrazine group, a hydrazone group, a carboxylic acid group or a salt thereof, a sulfonic acid group or a salt thereof, a phosphoric acid group or a salt thereof, a substituted or unsubstituted C₁-C₆₀ alkyl group, a substituted or unsubstituted C₁-C₆₀ alkoxy group, a substituted or unsubstituted C₃-C₁₀ cycloalkyl group, a substituted or unsubstituted C₆-C₆₀ aryl group, a substituted or unsubstituted C₆-C₆₀ aryloxy group, a substituted or unsubstituted C₆-C₆₀ arylthio group, a substituted or unsubstituted C₁-C₆₀ heteroaryl group, a substituted or unsubstituted monovalent non-aromatic condensed polycyclic group, and a substituted or unsubstituted monovalent non-aromatic condensed heteropolycyclic group;

at least one selected from X₁ to X₁₆ is CR_(ET);

R_(ET) is represented by any one of Formulae 2-1 to 2-8:

wherein in Formulae 2-1 to 2-8,

R₂₁ and R₂₂ are each independently selected from a hydrogen, a deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitro group, an amino group, an amidino group, a hydrazine group, a hydrazone group, a carboxylic acid group or a salt thereof, a sulfonic acid group or a salt thereof, a phosphoric acid group or a salt thereof, a substituted or unsubstituted C₁-C₆₀ alkyl group, a substituted or unsubstituted C₁-C₆₀ alkoxy group, a substituted or unsubstituted C₃-C₁₀ cycloalkyl group, a substituted or unsubstituted C₆-C₆₀ aryl group, a substituted or unsubstituted C₆-C₆₀ aryloxy group, a substituted or unsubstituted C₆-C₆₀ arylthio group, a substituted or unsubstituted C₁-C₆₀ heteroaryl group, a substituted or unsubstituted monovalent non-aromatic condensed polycyclic group, and a substituted or unsubstituted monovalent non-aromatic condensed heteropolycyclic group;

* indicates a binding site to a neighboring atom, and

at least one of substituents of the substituted C₁-C₆₀ alkyl group, substituted C₁-C₆₀ alkoxy group, substituted C₃-C₁₀ cycloalkyl group, substituted C₆-C₆₀ aryl group, substituted C₆-C₆₀ aryloxy group, substituted C₆-C₆₀ arylthio group, substituted C₁-C₆₀ heteroaryl group, substituted monovalent non-aromatic condensed polycyclic group, and substituted monovalent non-aromatic condensed heteropolycyclic group may be selected from

a deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitro group, an amino group, an amidino group, a hydrazine group, a hydrazone group, a carboxylic acid group or a salt thereof, a sulfonic acid group or a salt thereof, a phosphoric acid group or a salt thereof, a C₁-C₆₀ alkyl group, a C₂-C₆₀ alkenyl group, a C₂-C₆₀ alkynyl group, and a C₁-C₆₀ alkoxy group;

a C₁-C₆₀ alkyl group, a C₁-C₆₀ alkenyl group, a C₁-C₆₀ alkynyl group, and a C₁-C₆₀ alkoxy group, each substituted with at least one selected from deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitro group, an amino group, an amidino group, a hydrazine group, a hydrazone group, a carboxylic acid group or a salt thereof, a sulfonic acid group or a salt thereof, a phosphoric acid group or a salt thereof, a C₃-C₁₀ cycloalkyl group, a C₁-C₁₀ heterocycloalkyl group, a C₃-C₁₀ cycloalkenyl group, a C₁-C₁₀ heterocycloalkenyl group, a C₆-C₆₀ aryl group, a C₆-C₆₀ aryloxy group, a C₆-C₆₀ arylthio group, a C₁-C₆₀ heteroaryl group, a monovalent non-aromatic condensed polycyclic group, a monovalent non-aromatic condensed heteropolycyclic group, and —Si(Q₁₁)(Q₁₂)(Q₁₃);

a C₃-C₁₀ cycloalkyl group, a C₁-C₁₀ heterocycloalkyl group, a C₃-C₁₀ cycloalkenyl group, a C₁-C₁₀ heterocycloalkenyl group, a C₆-C₆₀ aryl group, a C₆-C₆₀ aryloxy group, a C₆-C₆₀ arylthio group, a C₁-C₆₀ heteroaryl group, a monovalent non-aromatic condensed polycyclic group, and a monovalent non-aromatic condensed heteropolycyclic group;

a C₃-C₁₀ cycloalkyl group, a C₁-C₁₀ heterocycloalkyl group, a C₃-C₁₀ cycloalkenyl group, a C₁-C₁₀ heterocycloalkenyl group, a C₆-C₆₀ aryl group, a C₆-C₆₀ aryloxy group, a C₆-C₆₀ arylthio group, a C₁-C₆₀ heteroaryl group, a monovalent non-aromatic condensed polycyclic group, and a monovalent non-aromatic condensed heteropolycyclic group, each substituted with at least one selected from a deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitro group, an amino group, an amidino group, a hydrazine group, a hydrazone group, a carboxylic acid group or a salt thereof, a sulfonic acid group or a salt thereof, a phosphoric acid group or a salt thereof, a C₁-C₆₀ alkyl group, a C₁-C₆₀ alkenyl group, a C₁-C₆₀ alkynyl group, a C₁-C₆₀ alkoxy group, a C₃-C₁₀ cycloalkyl group, a C₁-C₁₀ heterocycloalkyl group, a C₃-C₁₀ cycloalkenyl group, a C₁-C₁₀ heterocycloalkenyl group, a C₆-C₆₀ aryl group, a C₆-C₆₀ aryloxy group, a C₆-C₆₀ arylthio group, a C₁-C₆₀ heteroaryl group, a monovalent non-aromatic condensed polycyclic group, a monovalent non-aromatic condensed heteropolycyclic group, and —Si(Q₂₁)(Q₂₂)(Q₂₃); and

—Si(Q₃₁)(Q₃₂)(Q₃₃),

wherein Q₁₁ to Q₁₃, Q₂₁ to Q₂₃ and Q₃₁ to Q₃₃ may be each independently selected from a C₁-C₆₀ alkyl group, a C₆-C₆₀ aryl group, a C₁-C₆₀ heteroaryl group, a monovalent non-aromatic condensed polycyclic group, and a monovalent non-aromatic condensed heteropolycyclic group.

Another aspect of embodiments provides an organic light-emitting device including:

a first electrode;

a second electrode; and

an organic layer disposed between the first electrode and the second electrode, wherein the organic layer includes an emission layer and at least one of the condensed cyclic compound described above.

The condensed cyclic compound may be included in the emission layer, the emission layer may further include a dopant, and the condensed cyclic compound included in the emission layer may act as a host.

BRIEF DESCRIPTION OF THE DRAWINGS

These and/or other aspects will become apparent and more readily appreciated from the following description of the exemplary embodiments, taken in conjunction with the accompanying drawings in which:

FIG. 1 is a schematic cross-sectional view of an organic light-emitting device according to an embodiment;

FIG. 2 is a graph of normalized heat flow (Watts per gram) versus temperature (degrees Centigrade, ° C.) showing differential scanning calorimetry (DSC) results of Compound 53 according to an embodiment;

FIG. 3 is a graph of mass (percent, %) and d(mass)/d(temperature) (percent per degree Centigrade, %/° C.) versus temperature (degrees Centigrade, ° C.) showing thermogravimetric analysis (TGA) results of Compound 53 according to an embodiment;

FIG. 4 is a graph of normalized heat flow (Watts per gram) versus temperature (degrees Centigrade, ° C.) showing DSC results of Compound 55 according to an embodiment; and

FIG. 5 is a graph of mass (percent, %) and d(mass)/d(temperature) (percent per degree Centigrade, %/° C.) versus temperature (degrees Centigrade, ° C.) showing TGA results of Compound 55 according to an embodiment.

DETAILED DESCRIPTION

Reference will now be made in detail to exemplary embodiments, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to like elements throughout. In this regard, the present exemplary embodiments may have different forms and should not be construed as being limited to the descriptions set forth herein. Accordingly, the exemplary embodiments are merely described below, by referring to the figures, to explain aspects. As used herein, the term “and/or” includes any and all combinations of one or more of the associated listed items. Expressions such as “at least one of,” when preceding a list of elements, modify the entire list of elements and do not modify the individual elements of the list.

It will be understood that when an element is referred to as being “on” another element, it can be directly in contact with the other element or intervening elements may be present therebetween. In contrast, when an element is referred to as being “directly on” another element, there are no intervening elements present.

It will be understood that, although the terms first, second, third etc. may be used herein to describe various elements, components, regions, layers, and/or sections, these elements, components, regions, layers, and/or sections should not be limited by these terms. These terms are only used to distinguish one element, component, region, layer, or section from another element, component, region, layer, or section. Thus, a first element, component, region, layer, or section discussed below could be termed a second element, component, region, layer, or section without departing from the teachings of the present embodiments.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting. As used herein, the singular forms “a,” “an,” and “the” are intended to include the plural forms as well, unless the context clearly indicates otherwise.

It will be further understood that the terms “comprises” and/or “comprising,” or “includes” and/or “including” when used in this specification, specify the presence of stated features, regions, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, regions, integers, steps, operations, elements, components, and/or groups thereof.

Spatially relative terms, such as “beneath,” “below,” “lower,” “above,” “upper” and the like, may be used herein for ease of description to describe one element or feature's relationship to another element(s) or feature(s) as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as “below” or “beneath” other elements or features would then be oriented “above” the other elements or features. Thus, the exemplary term “below” can encompass both an orientation of above and below. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

“About” or “approximately” as used herein is inclusive of the stated value and means within an acceptable range of deviation for the particular value as determined by one of ordinary skill in the art, considering the measurement in question and the error associated with measurement of the particular quantity (i.e., the limitations of the measurement system). For example, “about” can mean within one or more standard deviations, or within ±30%, 20%, 10%, 5% of the stated value.

Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and the present disclosure, and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

Exemplary embodiments are described herein with reference to cross section illustrations that are schematic illustrations of idealized embodiments. As such, variations from the shapes of the illustrations as a result, for example, of manufacturing techniques and/or tolerances, are to be expected. Thus, embodiments described herein should not be construed as limited to the particular shapes of regions as illustrated herein but are to include deviations in shapes that result, for example, from manufacturing. For example, a region illustrated or described as flat may, typically, have rough and/or nonlinear features. Moreover, sharp angles that are illustrated may be rounded. Thus, the regions illustrated in the figures are schematic in nature and their shapes are not intended to illustrate the precise shape of a region and are not intended to limit the scope of the present claims.

A condensed cyclic compound according to an embodiment may be represented by Formula 1:

Formula 1

L₁ in Formula 1 may be selected from a phenylene group, a pyridinylene group, a pyrimidinylene group, and a triazinylene group.

In some embodiments, L₁ in Formula 1 may be selected from Formulae 3-1 to 3-14 below, but are not limited thereto:

wherein in Formulae 3-1 to 3-14,

* and *′ indicate each independently a binding site to a neighboring atom.

In some embodiments, L₁ in Formula 1 may be selected from Formulae 3-2, 3-3, 3-5 to 3-9, and 3-11 to 3-14, but embodiments are not limited thereto.

In some embodiments, L₁ in Formula 1 may be selected from Formulae 3-2, 3-5, 3-6, 3-7, 3-11, 3-12, and 3-14, but embodiments are not limited thereto.

In Formula 1, X₁ may be a nitrogen atom (N) or CR₁; X₂ is N or CR₂; X₃ is N or CR₃; X₄ is N or CR₄; X₅ is N or CR₅; X₆ is N or CR₆; X₇ is N or CR₇; X₅ is N or CR₈; X₉ is N or CR₉; X₁₀ is N or CR₁₀; X₁₁ is N or CR₁₁; X₁₂ is N or CR₁₂; X₁₃ is N or CR₁₃; X₁₄ is N or CR₁₄; X₁₅ is N or CR₁₅; and X₁₆ is N or CR₁₆.

In some embodiments, in Formula 1, X₁ may be CR₁; X₂ may be CR₂; X₃ may be CR₃; X₄ may be CR₄; X₅ may be CR₅; X₆ may be CR₆; X₇ may be CR₇; X₈ may be CR₈; X₉ may be CR₉; X₁₀ may be CR₁₀; X₁₁ may be CR₁₁; X₁₂ may be CR₁₂; X₁₃ may be CR₁₃; X₁₄ may be CR₁₄; X₁₅ may be CR₁₅; and X₁₆ may be CR₁₆, but embodiments are not limited thereto.

In some embodiments, in Formula 1, X₁ may be N; X₂ may be CR₂; X₃ may be CR₃; X₄ may be CR₄; X₅ may be CR₅; X₆ may be CR₆; X₇ may be CR₇; X₈ may be CR₈; X₉ may be CR₉; X₁₀ may be CR₁₀; X₁₁ may be CR₁₁; X₁₂ may be CR₁₂; X₁₃ may be CR₁₃; X₁₄ may be CR₁₄; X₁₅ may be CR₁₅; and X₁₆ may be CR₁₆, but embodiments are not limited thereto.

In some embodiments, in Formula 1, X₁ may be CR₁; X₂ may be N; X₃ may be CR₃; X₄ may be CR₄; X₅ may be CR₅; X₆ may be CR₆; X₇ may be CR₇; X₈ may be CR₈; X₉ may be CR₉; X₁₀ may be CR₁₀; X₁₁ may be CR₁₁; X₁₂ may be CR₁₂; X₁₃ may be CR₁₃; X₁₄ may be CR₁₄; X₁₅ may be CR₁₅; and X₁₆ may be CR₁₆, but embodiments are not limited thereto.

In some embodiments, in Formula 1, X₁ may be N; X₂ may be CR₂; X₃ may be CR₃; X₄ may be CR₄; X₅ may be CR₅; X₆ may be CR₆; X₇ may be CR₇; X₈ may be N; X₉ may be CR₉; X₁₀ may be CR₁₀; X₁₁ may be CR₁₁; X₁₂ may be CR₁₂; X₁₃ may be CR₁₃; X₁₄ may be CR₁₄; X₁₅ may be CR₁₅; and X₁₆ may be CR₁₆, but embodiments are not limited thereto.

In some embodiments, in Formula 1, X₁ may be CR₁; X₂ may be N; X₃ may be CR₃; X₄ may be CR₄; X₅ may be CR₅; X₆ may be CR₆; X₇ may be N; X₈ may be CR₈; X₉ may be CR₉; X₁₀ may be CR₁₀; X₁₁ may be CR₁₁; X₁₂ may be CR₁₂; X₁₃ may be CR₁₃; X₁₄ may be CR₁₄; X₁₅ may be CR₁₅; and X₁₆ may be CR₁₆, but embodiments are not limited thereto. R₁ to R₁₆ in Formula 1 may be each independently selected from R_(ET), a hydrogen, a deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitro group, an amino group, an amidino group, a hydrazine group, a hydrazone group, a carboxylic acid group or a salt thereof, a sulfonic acid group or a salt thereof, a phosphoric acid group or a salt thereof, a substituted or unsubstituted C₁-C₆₀ alkyl group, a substituted or unsubstituted C₁-C₆₀ alkoxy group, a substituted or unsubstituted C₃-C₁₀ cycloalkyl group, a substituted or unsubstituted C₆-C₆₀ aryl group, a substituted or unsubstituted C₆-C₆₀ aryloxy group, a substituted or unsubstituted C₆-C₆₀ arylthio group, a substituted or unsubstituted C₁-C₆₀ heteroaryl group, a substituted or unsubstituted monovalent non-aromatic condensed polycyclic group, and a substituted or unsubstituted monovalent non-aromatic condensed heteropolycyclic group;

at least one of substituents of the substituted C₁-C₆₀ alkyl group, substituted C₁-C₆₀ alkoxy group, substituted C₃-C₁₀ cycloalkyl group, substituted C₆-C₆₀ aryl group, substituted C₆-C₆₀ aryloxy group, substituted C₆-C₆₀ arylthio group, substituted C₁-C₆₀ heteroaryl group, substituted monovalent non-aromatic condensed polycyclic group, and substituted monovalent non-aromatic condensed heteropolycyclic group may be selected from

a deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitro group, an amino group, an amidino group, a hydrazine group, a hydrazone group, a carboxylic acid group or a salt thereof, a sulfonic acid group or a salt thereof, a phosphoric acid group or a salt thereof, a C₁-C₆₀ alkyl group, a C₂-C₆₀ alkenyl group, a C₂-C₆₀ alkynyl group, and a C₁-C₆₀ alkoxy group;

a C₁-C₆₀ alkyl group, a C₁-C₆₀ alkenyl group, a C₁-C₆₀ alkynyl group, and a C₁-C₆₀ alkoxy group, each substituted with at least one selected from deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitro group, an amino group, an amidino group, a hydrazine group, a hydrazone group, a carboxylic acid group or a salt thereof, a sulfonic acid group or a salt thereof, a phosphoric acid group or a salt thereof, a C₃-C₁₀ cycloalkyl group, a C₁-C₁₀ heterocycloalkyl group, a C₃-C₁₀ cycloalkenyl group, a C₁-C₁₀ heterocycloalkenyl group, a C₆-C₆₀ aryl group, a C₆-C₆₀ aryloxy group, a C₆-C₆₀ arylthio group, a C₁-C₆₀ heteroaryl group, a monovalent non-aromatic condensed polycyclic group, a monovalent non-aromatic condensed heteropolycyclic group, and —Si(Q₁₁)(Q₁₂)(Q₁₃);

a C₃-C₁₀ cycloalkyl group, a C₁-C₁₀ heterocycloalkyl group, a C₃-C₁₀ cycloalkenyl group, a C₁-C₁₀ heterocycloalkenyl group, a C₆-C₆₀ aryl group, a C₆-C₆₀ aryloxy group, a C₆-C₆₀ arylthio group, a C₁-C₆₀ heteroaryl group, a monovalent non-aromatic condensed polycyclic group, and a monovalent non-aromatic condensed heteropolycyclic group;

a C₃-C₁₀ cycloalkyl group, a C₁-C₁₀ heterocycloalkyl group, a C₃-C₁₀ cycloalkenyl group, a C₁-C₁₀ heterocycloalkenyl group, a C₆-C₆₀ aryl group, a C₆-C₆₀ aryloxy group, a C₆-C₆₀ arylthio group, a C₁-C₆₀ heteroaryl group, a monovalent non-aromatic condensed polycyclic group, and a monovalent non-aromatic condensed heteropolycyclic group, each substituted with at least one selected from a deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitro group, an amino group, an amidino group, a hydrazine group, a hydrazone group, a carboxylic acid group or a salt thereof, a sulfonic acid group or a salt thereof, a phosphoric acid group or a salt thereof, a C₁-C₆₀ alkyl group, a C₁-C₆₀ alkenyl group, a C₁-C₆₀ alkynyl group, a C₁-C₆₀ alkoxy group, a C₃-C₁₀ cycloalkyl group, a C₁-C₁₀ heterocycloalkyl group, a C₃-C₁₀ cycloalkenyl group, a C₁-C₁₀ heterocycloalkenyl group, a C₆-C₆₀ aryl group, a C₆-C₆₀ aryloxy group, a C₆-C₆₀ arylthio group, a C₁-C₆₀ heteroaryl group, a monovalent non-aromatic condensed polycyclic group, a monovalent non-aromatic condensed heteropolycyclic group, and —Si(Q₂₁)(Q₂₂)(Q₂₃); and

—Si(Q₃₁)(Q₃₂)(Q₃₃),

wherein Q₁₁ to Q₁₃, Q₂₁ to Q₂₃ and Q₃₁ to Q₃₃ may be each independently selected from a C₁-C₆₀ alkyl group, a C₆-C₆₀ aryl group, a C₁-C₆₀ heteroaryl group, a monovalent non-aromatic condensed polycyclic group, and a monovalent non-aromatic condensed heteropolycyclic group, and

R_(ET) will be described later in detail.

For example, R₁ to R₁₆ in Formula 1 may be each independently selected from R_(ET), a hydrogen, a deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitro group, a methyl group, an ethyl group, an n-propyl group, an iso-propyl group, an n-butyl group, an iso-butyl group, a sec-butyl group, a tert-butyl group, an n-pentyl group, an n-hexyl group, a methoxy group, an ethoxy group, an n-propoxy group, an iso-propoxy group, an n-butoxy group, a tert-butoxy group, a cyclopentyl group, a cyclohexyl group, a phenyl group, a pentalenyl group, an indenyl group, a naphthyl group, an azulenyl group, a heptalenyl group, an indacenyl group, an acenaphthyl group, a fluorenyl group, a spiro-fluorenyl group, a benzofluorenyl group, a dibenzofluorenyl group, a phenalenyl group, a phenanthrenyl group, an anthracenyl group, a fluoranthenyl group, a triphenylenyl group, a pyrenyl group, a chrysenyl group, a naphthacenyl group, a picenyl group, a perylenyl group, a pentaphenyl group, a hexacenyl group, a pentacenyl group, a rubicenyl group, a coronenyl group, an ovalenyl group, a pyrrolyl group, a thiophenyl group, a furanyl group, an imidazolyl group, a pyrazolyl group, a thiazolyl group, an isothiazolyl group, an oxazolyl group, an isoxazolyl group, a pyridinyl group, a pyrazinyl group, a pyrimidinyl group, a pyridazinyl group, an isoindolyl group, an indolyl group, an indazolyl group, a purinyl group, a quinolinyl group, an isoquinolinyl group, a benzoquinolinyl group, a phthalazinyl group, a naphthyridinyl group, a quinoxalinyl group, a quinazolinyl group, a cinnolinyl group, a carbazolyl group, a phenanthridinyl group, an acridinyl group, a phenanthrolinyl group, a phenazinyl group, a benzoimidazolyl group, a benzofuranyl group, a benzothiophenyl group, an isobenzothiazolyl group, a benzoxazolyl group, an isobenzoxazolyl group, a triazolyl group, a tetrazolyl group, an oxadiazolyl group, a triazinyl group, a dibenzofuranyl group, a dibenzothiophenyl group, a benzocarbazolyl group, and a dibenzocarbazolyl group; and

a methyl group, an ethyl group, an n-propyl group, an iso-propyl group, an n-butyl group, an iso-butyl group, a sec-butyl group, a tert-butyl group, an n-pentyl group, an n-hexyl group, a methoxy group, an ethoxy group, an n-propoxy group, an iso-propoxy group, an n-butoxy group, a tert-butoxy group, a cyclopentyl group, a cyclohexyl group, a phenyl group, a pentalenyl group, an indenyl group, a naphthyl group, an azulenyl group, a heptalenyl group, an indacenyl group, an acenaphthyl group, a fluorenyl group, a spiro-fluorenyl group, a benzofluorenyl group, a dibenzofluorenyl group, a phenalenyl group, a phenanthrenyl group, an anthracenyl group, a fluoranthenyl group, a triphenylenyl group, a pyrenyl group, a chrysenyl group, a naphthacenyl group, a picenyl group, a perylenyl group, a pentaphenyl group, a hexacenyl group, a pentacenyl group, a rubicenyl group, a coronenyl group, an ovalenyl group, a pyrrolyl group, a thiophenyl group, a furanyl group, an imidazolyl group, a pyrazolyl group, a thiazolyl group, an isothiazolyl group, an oxazolyl group, an isoxazolyl group, a pyridinyl group, a pyrazinyl group, a pyrimidinyl group, a pyridazinyl group, an isoindolyl group, an indolyl group, an indazolyl group, a purinyl group, a quinolinyl group, an isoquinolinyl group, a benzoquinolinyl group, a phthalazinyl group, a naphthyridinyl group, a quinoxalinyl group, a quinazolinyl group, a cinnolinyl group, a carbazolyl group, a phenanthridinyl group, an acridinyl group, a phenanthrolinyl group, a phenazinyl group, a benzoimidazolyl group, a benzofuranyl group, a benzothiophenyl group, an isobenzothiazolyl group, a benzoxazolyl group, an isobenzoxazolyl group, a triazolyl group, a tetrazolyl group, an oxadiazolyl group, a triazinyl group, a dibenzofuranyl group, a dibenzothiophenyl group, a benzocarbazolyl group and a dibenzocarbazolyl group, each substituted with at least one selected from a deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitro group, an amino group, an amidino group, a hydrazine group, a hydrazone group, a carboxylic acid group or a salt thereof, a sulfonic acid group or a salt thereof, a phosphoric acid group or a salt thereof, a C₁-C₂₀ alkyl group, a C₁-C₂₀ alkoxy group, a cyclopentyl group, a cyclohexyl group, a cycloheptyl group, a cyclopentenyl group, a cyclohexenyl group, a phenyl group, a pentalenyl group, an indenyl group, a naphthyl group, an azulenyl group, a heptalenyl group, an indacenyl group, an acenaphthyl group, a fluorenyl group, a spiro-fluorenyl group, a benzofluorenyl group, a dibenzofluorenyl group, a phenalenyl group, a phenanthrenyl group, an anthracenyl group, a fluoranthenyl group, a triphenylenyl group, a pyrenyl group, a chrysenyl group, a naphthacenyl group, a picenyl group, a perylenyl group, a pentaphenyl group, a hexacenyl group, a pentacenyl group, a rubicenyl group, a coronenyl group, an ovalenyl group, a pyrrolyl group, a thiophenyl group, a furanyl group, an imidazolyl group, a pyrazolyl group, a thiazolyl group, an isothiazolyl group, an oxazolyl group, an isoxazolyl group, a pyridinyl group, a pyrazinyl group, a pyrimidinyl group, a pyridazinyl group, an isoindolyl group, an indolyl group, an indazolyl group, a purinyl group, a quinolinyl group, an isoquinolinyl group, a benzoquinolinyl group, a phthalazinyl group, a naphthyridinyl group, a quinoxalinyl group, a quinazolinyl group, a cinnolinyl group, a carbazolyl group, a phenanthridinyl group, an acridinyl group, a phenanthrolinyl group, a phenazinyl group, a benzoimidazolyl group, a benzofuranyl group, a benzothiophenyl group, an isobenzothiazolyl group, a benzoxazolyl group, an isobenzoxazolyl group, a triazolyl group, a tetrazolyl group, an oxadiazolyl group, a triazinyl group, a dibenzofuranyl group, a dibenzothiophenyl group, a benzocarbazolyl group, and a dibenzocarbazolyl group, but embodiments are not limited thereto.

In some embodiments, R₁ to R₁₆ in Formula 1 may be each independently selected from R_(ET), a hydrogen, a deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitro group, a methyl group, an ethyl group, an n-propyl group, an iso-propyl group, an n-butyl group, an iso-butyl group, a sec-butyl group, a tert-butyl group, a phenyl group, a naphthyl group, a fluorenyl group, an anthracenyl group, a triphenylenyl group, a pyrrolyl group, a thiophenyl group, a furanyl group, a pyridinyl group, a pyrimidinyl group, a pyridazinyl group, an indolyl group, a quinolinyl group, an isoquinolinyl group, a carbazolyl group, a benzofuranyl group, a benzothiophenyl group, a triazolyl group, a triazinyl group, a dibenzofuranyl group, and a dibenzothiophenyl group; and

a phenyl group, a naphthyl group, a fluorenyl group, an anthracenyl group, a triphenylenyl group, a pyrrolyl group, a thiophenyl group, a furanyl group, a pyridinyl group, a pyrimidinyl group, a pyridazinyl group, an indolyl group, a quinolinyl group, an isoquinolinyl group, a carbazolyl group, a benzofuranyl group, a benzothiophenyl group, a triazolyl group, a triazinyl group, a dibenzofuranyl group and a dibenzothiophenyl group, each substituted with at least one selected from a deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitro group, a C₁-C₂₀ alkyl group, a phenyl group, a naphthyl group, a pyridinyl group, a pyrimidinyl group, and a triazinyl group, but embodiments are not limited thereto.

In some embodiments, R₁ to R₁₆ in Formula 1 may be each independently selected from R_(ET), a hydrogen, a deuterium, —F, —Cl, —Br, —I, a cyano group, a nitro group, a methyl group, an ethyl group, an n-propyl group, an iso-propyl group, an n-butyl group, an iso-butyl group, a sec-butyl group, a tert-butyl group, a phenyl group, and a naphthyl group, but embodiments are not limited thereto.

At least one selected from X₁ to X₁₆ in Formula 1 may be CR_(ET).

For example, one or two selected from X₁ to X₁₆ in Formula 1 may be selected from CR_(ET), but embodiments are not limited thereto.

In some embodiments, at least one selected from X₁ to X₁₆ in Formula 1 may be CR_(ET), but embodiments are not limited thereto.

In some embodiments, at least one selected from X₁₁ and X₁₄ in Formula 1 may be CR_(ET), but embodiments are not limited thereto.

In some embodiments, X₁₄ in Formula 1 may be CR_(ET), but embodiments are not limited thereto.

In some embodiments, at least one selected from X₁₀ and X₁₅ in Formula 1 may be CR_(ET), but embodiments are not limited thereto.

In some embodiments, X₁₅ in Formula 1 may be CR_(ET), but embodiments are not limited thereto.

R_(ET) in Formula 1 may be a group represented by any one of Formulae 2-1 to 2-8:

In Formulae 2-1 to 2-8, R₂₁ and R₂₂ will be described in detail later, and * indicates a binding site to a neighboring atom.

For example, R_(ET) in Formula 1 may be a group represented by any one selected from Formulae 2-1, 2-3, 2-4, and 2-6, but embodiments are not limited thereto.

R₂₁ and R₂₂ in Formulae 2-1 to 2-8 may be each independently selected from a hydrogen, a deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitro group, an amino group, an amidino group, a hydrazine group, a hydrazone group, a carboxylic acid group or a salt thereof, a sulfonic acid group or a salt thereof, a phosphoric acid group or a salt thereof, a substituted or unsubstituted C₁-C₆₀ alkyl group, a substituted or unsubstituted C₁-C₆₀ alkoxy group, a substituted or unsubstituted C₃-C₁₀ cycloalkyl group, a substituted or unsubstituted C₆-C₆₀ aryl group, a substituted or unsubstituted C₆-C₆₀ aryloxy group, a substituted or unsubstituted C₆-C₆₀ arylthio group, a substituted or unsubstituted C₁-C₆₀ heteroaryl group, a substituted or unsubstituted monovalent non-aromatic condensed polycyclic group, and a substituted or unsubstituted monovalent non-aromatic condensed heteropolycyclic group;

at least one of substituents of the substituted C₁-C₆₀ alkyl group, substituted C₁-C₆₀ alkoxy group, substituted C₃-C₁₀ cycloalkyl group, substituted C₆-C₆₀ aryl group, substituted C₆-C₆₀ aryloxy group, substituted C₆-C₆₀ arylthio group, substituted C₁-C₆₀ heteroaryl group, substituted monovalent non-aromatic condensed polycyclic group, and substituted monovalent non-aromatic condensed heteropolycyclic group may be selected from

a deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitro group, an amino group, an amidino group, a hydrazine group, a hydrazone group, a carboxylic acid group or a salt thereof, a sulfonic acid group or a salt thereof, a phosphoric acid group or a salt thereof, a C₁-C₆₀ alkyl group, a C₂-C₆₀ alkenyl group, a C₂-C₆₀ alkynyl group, and a C₁-C₆₀ alkoxy group;

a C₁-C₆₀ alkyl group, a C₁-C₆₀ alkenyl group, a C₁-C₆₀ alkynyl group, and a C₁-C₆₀ alkoxy group, each substituted with at least one selected from deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitro group, an amino group, an amidino group, a hydrazine group, a hydrazone group, a carboxylic acid group or a salt thereof, a sulfonic acid group or a salt thereof, a phosphoric acid group or a salt thereof, a C₃-C₁₀ cycloalkyl group, a C₁-C₁₀ heterocycloalkyl group, a C₃-C₁₀ cycloalkenyl group, a C₁-C₁₀ heterocycloalkenyl group, a C₆-C₆₀ aryl group, a C₆-C₆₀ aryloxy group, a C₆-C₆₀ arylthio group, a C₁-C₆₀ heteroaryl group, a monovalent non-aromatic condensed polycyclic group, a monovalent non-aromatic condensed heteropolycyclic group, and —Si(Q₁₁)(Q₁₂)(Q₁₃);

a C₃-C₁₀ cycloalkyl group, a C₁-C₁₀ heterocycloalkyl group, a C₃-C₁₀ cycloalkenyl group, a C₁-C₁₀ heterocycloalkenyl group, a C₆-C₆₀ aryl group, a C₆-C₆₀ aryloxy group, a C₆-C₆₀ arylthio group, a C₁-C₆₀ heteroaryl group, a monovalent non-aromatic condensed polycyclic group, and a monovalent non-aromatic condensed heteropolycyclic group;

a C₃-C₁₀ cycloalkyl group, a C₁-C₁₀ heterocycloalkyl group, a C₃-C₁₀ cycloalkenyl group, a C₁-C₁₀ heterocycloalkenyl group, a C₆-C₆₀ aryl group, a C₆-C₆₀ aryloxy group, a C₆-C₆₀ arylthio group, a C₁-C₆₀ heteroaryl group, a monovalent non-aromatic condensed polycyclic group, and a monovalent non-aromatic condensed heteropolycyclic group, each substituted with at least one selected from a deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitro group, an amino group, an amidino group, a hydrazine group, a hydrazone group, a carboxylic acid group or a salt thereof, a sulfonic acid group or a salt thereof, a phosphoric acid group or a salt thereof, a C₁-C₆₀ alkyl group, a C₁-C₆₀ alkenyl group, a C₁-C₆₀ alkynyl group, a C₁-C₆₀ alkoxy group, a C₃-C₁₀ cycloalkyl group, a C₁-C₁₀ heterocycloalkyl group, a C₃-C₁₀ cycloalkenyl group, a C₁-C₁₀ heterocycloalkenyl group, a C₆-C₆₀ aryl group, a C₆-C₆₀ aryloxy group, a C₆-C₆₀ arylthio group, a C₁-C₆₀ heteroaryl group, a monovalent non-aromatic condensed polycyclic group, a monovalent non-aromatic condensed heteropolycyclic group, and —Si(Q₂₁)(Q₂₂)(Q₂₃); and

—Si(Q₃₁)(Q₃₂)(Q₃₃),

wherein Q₁₁ to Q₁₃, Q₂₁ to Q₂₃ and Q₃₁ to Q₃₃ may be each independently selected from a C₁-C₆₀ alkyl group, a C₆-C₆₀ aryl group, a C₁-C₆₀ heteroaryl group, a monovalent non-aromatic condensed polycyclic group, and a monovalent non-aromatic condensed heteropolycyclic group.

R₂₁ and R₂₂ in Formulae 2-1 to 2-8 may be each independently selected from a phenyl group, a pentalenyl group, an indenyl group, a naphthyl group, an azulenyl group, a heptalenyl group, an indacenyl group, an acenaphthyl group, a fluorenyl group, a spiro-fluorenyl group, a benzofluorenyl group, a dibenzofluorenyl group, a phenalenyl group, a phenanthrenyl group, an anthracenyl group, a fluoranthenyl group, a triphenylenyl group, a pyrenyl group, a chrysenyl group, a naphthacenyl group, a picenyl group, a perylenyl group, a pentaphenyl group, a hexacenyl group, a pentacenyl group, a rubicenyl group, a coronenyl group, an ovalenyl group, a pyrrolyl group, a thiophenyl group, a furanyl group, an imidazolyl group, a pyrazolyl group, a thiazolyl group, an isothiazolyl group, an oxazolyl group, an isoxazolyl group, a pyridinyl group, a pyrazinyl group, a pyrimidinyl group, a pyridazinyl group, an isoindolyl group, an indolyl group, an indazolyl group, a furinyl group, a quinolinyl group, an isoquinolinyl group, a benzoquinolinyl group, a phthalazinyl group, a naphthyridinyl group, a quinoxalinyl group, a quinazolinyl group, a cinnolinyl group, a carbazolyl group, a phenanthridinyl group, an acridinyl group, a phenanthrolinyl group, a phenazinyl group, a benzoimidazolyl group, a benzofuranyl group, a benzothiophenyl group, an isobenzothiazolyl group, a benzoxazolyl group, an isobenzoxazolyl group, a triazolyl group, a tetrazolyl group, an oxadiazolyl group, a triazinyl group, a dibenzofuranyl group, a dibenzothiophenyl group, a benzocarbazolyl group, a dibenzocarbazolyl group, a thiadiazolyl group, an imidazopyridinyl group, and an imidazopyrimidinyl group; and

a methyl group, an ethyl group, an n-propyl group, an iso-propyl group, an n-butyl group, an iso-butyl group, a sec-butyl group, a tert-butyl group, an n-pentyl group, an n-hexyl group, a methoxy group, an ethoxy group, an n-propoxy group, an iso-propoxy group, an n-butoxy group, a tert-butoxy group, a cyclopentyl group, a cyclohexyl group, a phenyl group, a pentalenyl group, an indenyl group, a naphthyl group, an azulenyl group, a heptalenyl group, an indacenyl group, an acenaphthyl group, a fluorenyl group, a spiro-fluorenyl group, a benzofluorenyl group, a dibenzofluorenyl group, a phenalenyl group, a phenanthrenyl group, an anthracenyl group, a fluoranthenyl group, a triphenylenyl group, a pyrenyl group, a chrysenyl group, a naphthacenyl group, a picenyl group, a perylenyl group, a pentaphenyl group, a hexacenyl group, a pentacenyl group, a rubicenyl group, a coronenyl group, an ovalenyl group, a pyrrolyl group, a thiophenyl group, a furanyl group, an imidazolyl group, a pyrazolyl group, a thiazolyl group, an isothiazolyl group, an oxazolyl group, an isoxazolyl group, a pyridinyl group, a pyrazinyl group, a pyrimidinyl group, a pyridazinyl group, an isoindolyl group, an indolyl group, an indazolyl group, a purinyl group, a quinolinyl group, an isoquinolinyl group, a benzoquinolinyl group, a phthalazinyl group, a naphthyridinyl group, a quinoxalinyl group, a quinazolinyl group, a cinnolinyl group, a carbazolyl group, a phenanthridinyl group, an acridinyl group, a phenanthrolinyl group, a phenazinyl group, a benzoimidazolyl group, a benzofuranyl group, a benzothiophenyl group, an isobenzothiazolyl group, a benzoxazolyl group, an isobenzoxazolyl group, a triazolyl group, a tetrazolyl group, an oxadiazolyl group, a triazinyl group, a dibenzofuranyl group, a dibenzothiophenyl group, a benzocarbazolyl group and a dibenzocarbazolyl group, each substituted with at least one selected from a deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitro group, an amino group, an amidino group, a hydrazine group, a hydrazone group, a carboxylic acid group or a salt thereof, a sulfonic acid group or a salt thereof, a phosphoric acid group or a salt thereof, a C₁-C₂₀ alkyl group, a C₁-C₂₀ alkoxy group, a cyclopentyl group, a cyclohexyl group, a cycloheptyl group, a cyclopentenyl group, a cyclohexenyl group, a phenyl group, a pentalenyl group, an indenyl group, a naphthyl group, an azulenyl group, a heptalenyl group, an indacenyl group, an acenaphthyl group, a fluorenyl group, a spiro-fluorenyl group, a benzofluorenyl group, a dibenzofluorenyl group, a phenalenyl group, a phenanthrenyl group, an anthracenyl group, a fluoranthenyl group, a triphenylenyl group, a pyrenyl group, a chrysenyl group, a naphthacenyl group, a picenyl group, a perylenyl group, a pentaphenyl group, a hexacenyl group, a pentacenyl group, a rubicenyl group, a coronenyl group, an ovalenyl group, a pyrrolyl group, a thiophenyl group, a furanyl group, an imidazolyl group, a pyrazolyl group, a thiazolyl group, an isothiazolyl group, an oxazolyl group, an isoxazolyl group, a pyridinyl group, a pyrazinyl group, a pyrimidinyl group, a pyridazinyl group, an isoindolyl group, an indolyl group, an indazolyl group, a purinyl group, a quinolinyl group, an isoquinolinyl group, a benzoquinolinyl group, a phthalazinyl group, a naphthyridinyl group, a quinoxalinyl group, a quinazolinyl group, a cinnolinyl group, a carbazolyl group, a phenanthridinyl group, an acridinyl group, a phenanthrolinyl group, a phenazinyl group, a benzoimidazolyl group, a benzofuranyl group, a benzothiophenyl group, an isobenzothiazolyl group, a benzoxazolyl group, an isobenzoxazolyl group, a triazolyl group, a tetrazolyl group, an oxadiazolyl group, a triazinyl group, a dibenzofuranyl group, a dibenzothiophenyl group, a benzocarbazolyl group, and a dibenzocarbazolyl group, but embodiments are not limited thereto.

In some embodiments, R₂₁ and R₂₂ in Formulae 2-1 to 2-8 may be each independently selected from a hydrogen, a deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitro group, a methyl group, an ethyl group, an n-propyl group, an iso-propyl group, an n-butyl group, an iso-butyl group, a sec-butyl group, a tert-butyl group, an n-pentyl group, an n-hexyl group, a methoxy group, an ethoxy group, an n-propoxy group, an iso-propoxy group, an n-butoxy group, a tert-butoxy group, a cyclopentyl group, a cyclohexyl group, a phenyl group, a naphthyl group, a fluorenyl group, a pyridinyl group, a pyrimidinyl group, a pyridazinyl group, and a triazinyl group; and

a phenyl group, a naphthyl group, a fluorenyl group, a pyridinyl group, a pyrimidinyl group, a pyridazinyl group, and a triazinyl group, each substituted with at least one selected from a deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitro group, a C₁-C₂₀ alkyl group, a phenyl group, a naphthyl group, a pyridinyl group, a pyrimidinyl group, and a triazinyl group, but embodiments are not limited thereto.

In some embodiments, R₂₁ and R₂₂ in Formulae 2-1 to 2-8 may be each independently selected from a hydrogen, a deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitro group, a methyl group, an ethyl group, an n-propyl group, an iso-propyl group, an n-butyl group, an iso-butyl group, a sec-butyl group, a tert-butyl group, an n-pentyl group, an n-hexyl group, a phenyl group, a naphthyl group, a pyridinyl group, a pyrimidinyl group, a pyridazinyl group, and a triazinyl group; and

a phenyl group substituted with at least one selected from —F and a cyano group, but embodiments are not limited thereto.

In some embodiments, R₂₁ and R₂₂ in Formulae 2-1 to 2-8 may be each independently selected from a hydrogen, a deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitro group, a methyl group, an ethyl group, an n-propyl group, an iso-propyl group, an n-butyl group, an iso-butyl group, a sec-butyl group, a tert-butyl group, an n-pentyl group, an n-hexyl group, and a group represented by Formulae 4-1 to 4-11 below, but embodiments are not limited thereto:

wherein in Formulae 4-1 to 4-11,

* indicates a binding site to a neighboring atom.

In some embodiments, R_(ET) in Formula 1 may be a group represented by any one selected from Formulae 5-1 to 5-24, but embodiments are not limited thereto:

wherein in Formulae 5-1 to 5-24,

* indicates a binding site to a neighboring atom.

In some embodiments, the condensed cyclic compound may be represented by any one of Formulae 1A to 1E:

wherein, in Formulae 1A to 1E,

L₁ is selected from a phenylene group, a pyridinylene group, a pyrimidinylene group, and a triazinylene group;

R₁ to R₁₆ may be each independently selected from R_(ET), a hydrogen, a deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitro group, a methyl group, an ethyl group, an n-propyl group, an iso-propyl group, an n-butyl group, an iso-butyl group, a sec-butyl group, a tert-butyl group, a phenyl group, a naphthyl group, a fluorenyl group, an anthracenyl group, a triphenylenyl group, a pyrrolyl group, a thiophenyl group, a furanyl group, a pyridinyl group, a pyrimidinyl group, a pyridazinyl group, an indolyl group, a quinolinyl group, an isoquinolinyl group, a carbazolyl group, a benzofuranyl group, a benzothiophenyl group, a triazolyl group, a triazinyl group, a dibenzofuranyl group, and a dibenzothiophenyl group; and

a phenyl group, a naphthyl group, a fluorenyl group, an anthracenyl group, a triphenylenyl group, a pyrrolyl group, a thiophenyl group, a furanyl group, a pyridinyl group, a pyrimidinyl group, a pyridazinyl group, an indolyl group, a quinolinyl group, an isoquinolinyl group, a carbazolyl group, a benzofuranyl group, a benzothiophenyl group, a triazolyl group, a triazinyl group, a dibenzofuranyl group and a dibenzothiophenyl group, each substituted with at least one selected from a deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitro group, a C₁-C₂₀ alkyl group, a phenyl group, a naphthyl group, a pyridinyl group, a pyrimidinyl group, and a triazinyl group.

At least one selected from R₁ to R₁₆ is R_(ET); and R_(ET) is a group represented by any one selected from Formulae 2-1 to 2-8 below:

wherein in Formulae 2-1 to 2-8,

R₂₁ and R₂₂ may be each independently selected from a hydrogen, a deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitro group, a methyl group, an ethyl group, an n-propyl group, an iso-propyl group, an n-butyl group, an iso-butyl group, a sec-butyl group, a tert-butyl group, an n-pentyl group, an n-hexyl group, a methoxy group, an ethoxy group, an n-propoxy group, an iso-propoxy group, an n-butoxy group, a tert-butoxy group, a cyclopentyl group, a cyclohexyl group, a phenyl group, a naphthyl group, a fluorenyl group, a pyridinyl group, a pyrimidinyl group, a pyridazinyl group, and a triazinyl group; and

a phenyl group, a naphthyl group, a fluorenyl group, a pyridinyl group, a pyrimidinyl group, a pyridazinyl group, and a triazinyl group, each substituted with at least one selected from a deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitro group, a C₁-C₂₀ alkyl group, a phenyl group, a naphthyl group, a pyridinyl group, a pyrimidinyl group, and a triazinyl group.

* indicates a binding site to a neighboring atom.

In some embodiments, R₁ to R₁₃, R₁₅, and R₁₆ in Formulae 1A to 1E may be each independently selected from a hydrogen, a deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitro group, a methyl group, an ethyl group, an n-propyl group, an iso-propyl group, an n-butyl group, an iso-butyl group, a sec-butyl group, a tert-butyl group, a phenyl group, a naphthyl group, a fluorenyl group, an anthracenyl group, a triphenylenyl group, a pyrrolyl group, a thiophenyl group, a furanyl group, a pyridinyl group, a pyrimidinyl group, a pyridazinyl group, an indolyl group, a quinolinyl group, an isoquinolinyl group, a carbazolyl group, a benzofuranyl group, a benzothiophenyl group, a triazolyl group, a triazinyl group, a dibenzofuranyl group, and a dibenzothiophenyl group; and

a phenyl group, a naphthyl group, a fluorenyl group, an anthracenyl group, a triphenylenyl group, a pyrrolyl group, a thiophenyl group, a furanyl group, a pyridinyl group, a pyrimidinyl group, a pyridazinyl group, an indolyl group, a quinolinyl group, an isoquinolinyl group, a carbazolyl group, a benzofuranyl group, a benzothiophenyl group, a triazolyl group, a triazinyl group, a dibenzofuranyl group and a dibenzothiophenyl group, each substituted with at least one selected from a deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitro group, a C₁-C₂₀ alkyl group, a phenyl group, a naphthyl group, a pyridinyl group, a pyrimidinyl group, and a triazinyl group;

R₁₄ may be R_(ET), but is not limited thereto.

In some embodiments, R₁ to R₉, R₁₁ to R₁₃, R₁₅, and R₁₆ in Formulae 1A to 1E may be each independently selected from a hydrogen, a deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitro group, a methyl group, an ethyl group, an n-propyl group, an iso-propyl group, an n-butyl group, an iso-butyl group, a sec-butyl group, a tert-butyl group,

a phenyl group, a naphthyl group, a fluorenyl group, an anthracenyl group, a triphenylenyl group, a pyrrolyl group, a thiophenyl group, a furanyl group, a pyridinyl group, a pyrimidinyl group, a pyridazinyl group, an indolyl group, a quinolinyl group, an isoquinolinyl group, a carbazolyl group, a benzofuranyl group, a benzothiophenyl group, a triazolyl group, a triazinyl group, a dibenzofuranyl group, and a dibenzothiophenyl group; and a phenyl group, a naphthyl group, a fluorenyl group, an anthracenyl group, a triphenylenyl group, a pyrrolyl group, a thiophenyl group, a furanyl group, a pyridinyl group, a pyrimidinyl group, a pyridazinyl group, an indolyl group, a quinolinyl group, an isoquinolinyl group, a carbazolyl group, a benzofuranyl group, a benzothiophenyl group, a triazolyl group, a triazinyl group, a dibenzofuranyl group and a dibenzothiophenyl group, each substituted with at least one selected from a deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitro group, a C₁-C₂₀ alkyl group, a phenyl group, a naphthyl group, a pyridinyl group, a pyrimidinyl group, and a triazinyl group;

R₁₀ may be a hydrogen;

R₁₄ may be R_(ET), but is not limited thereto.

In some embodiments, R₁ to R₉, R₁₁ to R₁₃, R₁₅, and R₁₆ in Formulae 1A to 1E may be each independently selected from a hydrogen, a deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitro group, a methyl group, an ethyl group, an n-propyl group, an iso-propyl group, an n-butyl group, an iso-butyl group, a sec-butyl group, a tert-butyl group, a phenyl group, a naphthyl group, a fluorenyl group, an anthracenyl group, a triphenylenyl group, a pyrrolyl group, a thiophenyl group, a furanyl group, a pyridinyl group, a pyrimidinyl group, a pyridazinyl group, an indolyl group, a quinolinyl group, an isoquinolinyl group, a carbazolyl group, a benzofuranyl group, a benzothiophenyl group, a triazolyl group, a triazinyl group, a dibenzofuranyl group, and a dibenzothiophenyl group; and

a phenyl group, a naphthyl group, a fluorenyl group, an anthracenyl group, a triphenylenyl group, a pyrrolyl group, a thiophenyl group, a furanyl group, a pyridinyl group, a pyrimidinyl group, a pyridazinyl group, an indolyl group, a quinolinyl group, an isoquinolinyl group, a carbazolyl group, a benzofuranyl group, a benzothiophenyl group, a triazolyl group, a triazinyl group, a dibenzofuranyl group and a dibenzothiophenyl group, each substituted with at least one selected from a deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitro group, a C₁-C₂₀ alkyl group, a phenyl group, a naphthyl group, a pyridinyl group, a pyrimidinyl group, and a triazinyl group;

R₁₀ may be a hydrogen;

R₁₄ may be represented by a group represented by any one of Formulae 5-1 to 5-24 below, but embodiments are not limited thereto:

wherein in Formulae 5-1 to 5-24,

* indicates a binding site to a neighboring atom.

In some embodiments, the condensed cyclic compound may be represented by any one selected from Formula 1-1 to 1-9:

wherein in Formulae 1-1 to 1-9,

L₁ is selected from a phenylene group, a pyridinylene group, a pyrimidinylene group, and a triazinylene group;

R₃, R₆, and R₁₄ may be each independently selected from R_(ET), a hydrogen, a deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitro group, a methyl group, an ethyl group, an n-propyl group, an iso-propyl group, an n-butyl group, an iso-butyl group, a sec-butyl group, a tert-butyl group, a phenyl group, a naphthyl group, a fluorenyl group, an anthracenyl group, a triphenylenyl group, a pyrrolyl group, a thiophenyl group, a furanyl group, a pyridinyl group, a pyrimidinyl group, a pyridazinyl group, an indolyl group, a quinolinyl group, an isoquinolinyl group, a carbazolyl group, a benzofuranyl group, a benzothiophenyl group, a triazolyl group, a triazinyl group, a dibenzofuranyl group, and a dibenzothiophenyl group; and

a phenyl group, a naphthyl group, a fluorenyl group, an anthracenyl group, a triphenylenyl group, a pyrrolyl group, a thiophenyl group, a furanyl group, a pyridinyl group, a pyrimidinyl group, a pyridazinyl group, an indolyl group, a quinolinyl group, an isoquinolinyl group, a carbazolyl group, a benzofuranyl group, a benzothiophenyl group, a triazolyl group, a triazinyl group, a dibenzofuranyl group and a dibenzothiophenyl group, each substituted with at least one selected from a deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitro group, a C₁-C₂₀ alkyl group, a phenyl group, a naphthyl group, a pyridinyl group, a pyrimidinyl group, and a triazinyl group;

at least one selected from R₃, R₆, and R₁₄ may be R_(ET);

R_(ET) is represented by any one of Formulae 2-1 to 2-8:

wherein in Formulae 2-1 to 2-8,

R₂₁ and R₂₂ may be each independently selected from a hydrogen, a deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitro group, a methyl group, an ethyl group, an n-propyl group, an iso-propyl group, an n-butyl group, an iso-butyl group, a sec-butyl group, a tert-butyl group, an n-pentyl group, an n-hexyl group, a methoxy group, an ethoxy group, an n-propoxy group, an iso-propoxy group, an n-butoxy group, a tert-butoxy group, a cyclopentyl group, a cyclohexyl group, a phenyl group, a naphthyl group, a fluorenyl group, a pyridinyl group, a pyrimidinyl group, a pyridazinyl group, and a triazinyl group; and

a phenyl group, a naphthyl group, a fluorenyl group, a pyridinyl group, a pyrimidinyl group, a pyridazinyl group, and a triazinyl group, each substituted with at least one selected from a deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitro group, a C₁-C₂₀ alkyl group, a phenyl group, a naphthyl group, a pyridinyl group, a pyrimidinyl group, and a triazinyl group.

* indicates a binding site to a neighboring atom.

For example, R_(ET) in Formula 1-1 to 1-9 may be selected from Formulae 5-1 to 5-24 below, but embodiments are not limited thereto:

wherein in Formulae 5-1 to 5-24,

* indicates a binding site to a neighboring atom.

In some embodiments, the condensed cyclic compound may be selected from Compounds 1 to 107 below, but are not limited thereto:

The condensed cyclic compound represented by Formula 1 may have a triplet energy of 2.5 electron volt (eV) to 3.3 eV.

The condensed cyclic compound represented by Formula 1 may have a glass transition temperature (Tg) of 100° C. to 200° C.

The condensed cyclic compound represented by Formula 1 may have a decomposition temperature(Td) of 300° C. to 450° C.

The structure of the condensed cyclic compound represented by Formula 1 may be controlled such that its conjugation length is increased only to such a level that the structure of “carbazolyl-L₁-carbazolyl-triazolyl” is included in its conjugation segment. Thus, the condensed cyclic compound represented by Formula 1 may have a high triplet energy. Accordingly, efficiency of an organic light-emitting device including the condensed cyclic compound may be improved.

The condensed cyclic compound represented by Formula 1 may have at least one triazole group as a substituent. As illustrated in Formula 1′, a conjugation length of the condensed cyclic compound represented by Formula 1 may vary according to whether R₂₁ and R₂₂, which are substituents of a triazole group, are involved in the conjugation:

The condensed cyclic compound represented by Formula 1 includes two carbazolyl groups, as illustrated in Formula 1″. The condensed cyclic compound represented by Formula 1 may have high thermal stability and high charge mobility due to characteristics of substituents of the carbazolyl group.

The condensed cyclic compound represented by Formula 1 may have a molecular weight of 550 grams per mole (g/mol) or more, for example, a molecular weight of 550 to 700 g/mol. However, embodiments are not limited thereto. When the molecular weight satisfies the conditions described above, the condensed cyclic compound represented by Formula 1 may have a Td that is suitable for deposition. When the molecular weight satisfies the conditions described above, the condensed cyclic compound represented by Formula 1 may have a sufficient Tg. Accordingly, an organic light-emitting device including the condensed cyclic compound represented by Formula 1 may have improved thermal stability.

A molecular weight, the highest occupied molecular orbital (HOMO) energy level, the lowest unoccupied molecular orbital (LUMO) energy level, and the triplet energy level T₁ of some of the condensed cyclic compound represented by Formula 1 w as evaluated by using a Gaussian 09 program accompanied with optimization of molecular structure according to B3LYP-based density functional theory (DFT). The results thereof are shown in Table 1 below.

TABLE 1 HOMO (eV) LUMO (eV) T₁ (eV) Molecular weight   1 −5.627 −2.257 2.699 677   2 −5.336 −1.144 3.086 627   3 −5.324 −1.153 3.079 627   4 −5.318 −1.166 3.086 627   5 −5.291 −1.265 3.005 627   6 −5.47 −1.044 3.125 629   7 −5.242 −1.066 2.908 629   8 −5.437 −1.155 3.137 627   9 −5.321 −1.123 3.113 627  10 −5.398 −1.448 3.104 629  11 −5.411 −1.429 3.076 629  12 −5.348 −1.64 3.049 629  13 −5.364 −1.523 3.049 629  14 −5.403 −1.396 3.116 629  15 −5.282 −1.302 2.902 631  16 −5.535 −1.562 3.131 629  17 −5.421 −1.432 3.106 629  18 −5.576 −2.148 2.918 677  19 −5.688 −2.297 2.927 677  20 −5.465 −1.956 2.871 679  21 −5.7 −2.203 2.978 677  22 −5.538 −2.358 2.744 677  23 −5.578 −2.15 2.839 677  24 −5.579 −2.178 2.839 677  25 −5.718 −2.161 2.777 677  26 −5.573 −1.318 2.974 627  27 −5.579 −1.361 2.872 627  28 −5.381 −1.254 2.798 627  29 −5.591 −1.327 3.102 627  30 −5.588 −1.246 2.89 627  31 −5.293 −0.998 2.748 629  32 −5.448 −1.193 2.902 627  33 −5.591 −1.315 2.977 627  34 −5.63 −1.593 2.989 629  35 −5.627 −1.62 2.869 629  36 −5.43 −1.686 2.77 629  37 −5.664 −1.562 3.103 629  38 −5.665 −1.565 2.855 629  39 −5.448 −1.238 2.75 631  40 −5.476 −1.611 2.851 629  41 −5.646 −1.575 2.991 629  42 −5.689 −2.111 2.91 677  43 −5.618 −2.244 2.71 677  44 −5.555 −1.987 2.693 679  45 −5.711 −2.234 2.713 677  46 −5.552 −2.406 2.609 677  47 −5.661 −2.154 2.731 677  48 −5.672 −2.163 2.832 677  49 −5.748 −2.164 2.777 677  50 −5.556 −1.13 3.054 627  51 −5.49 −1.111 2.975 627  52 −5.241 −1.164 2.925 627  53 −5.647 −1.296 3.141 627  54 −5.392 −1.018 3.022 627  55 −5.138 −0.911 2.78 629  56 −5.267 −1.083 3.01 627  57 −5.587 −1.107 3.105 627  58 −5.615 −1.445 3.072 629  59 −5.61 −1.436 2.973 629  60 −5.375 −1.627 2.848 629  61 −5.735 −1.515 3.155 629  62 −5.555 −1.494 3.019 629  63 −5.281 −1.171 2.768 631  64 −5.413 −1.477 2.945 629  65 −5.674 −1.361 3.107 629  66 −5.7 −2.086 2.934 677  67 −5.573 −2.267 2.629 677  68 −5.489 −1.891 2.732 679  69 −5.624 −2.247 2.754 677  70 −5.563 −2.359 2.558 677  71 −5.672 −2.119 2.771 677  72 −5.7 −2.126 2.837 677  73 −5.752 −2.174 2.781 677  74 −5.568 −1.228 3.071 627  75 −5.522 −1.269 2.959 627  76 −5.209 −1.223 2.839 627  77 −5.632 −1.268 3.118 627  78 −5.429 −1.144 2.998 627  79 −5.341 −0.97 2.921 629  80 −5.309 −1.14 3.024 627  81 −5.593 −1.19 3.102 627  82 −5.638 −1.491 3.094 629  83 −5.619 −1.531 2.964 629  84 −5.322 −1.67 2.791 629  85 −5.723 −1.496 3.134 629  86 −5.586 −1.448 3 629  87 −5.459 −1.181 2.925 631  88 −5.429 −1.562 2.992 629  89 −5.687 −1.436 3.107 629  90 −5.718 −2.082 2.949 677  91 −5.582 −2.313 2.741 677  92 −5.602 −1.842 2.922 679  93 −5.63 −2.247 2.856 677  94 −5.531 −2.403 2.58 677  95 −5.668 −2.159 2.814 677  96 −5.703 −2.143 2.862 677  97 −5.461 −1.503 3.051 628  98 −5.609 −1.484 3.008 628  99 −5.496 −1.255 3.056 628 100 −5.601 −1.265 3.054 628 101 −5.611 −1.675 3.03 629 102 −5.394 −1.607 3.059 629 103 −5.641 −1.851 2.829 629 104 −5.32 −1.793 3.043 629 105 −5.555 −1.267 3.042 628 106 −5.707 −1.538 3.023 629 107 −5.737 −1.599 3.022 630

Synthesis methods of the condensed cyclic compound represented by Formula 1 may be easily understood by one of ordinary skill in the art by referring to Synthesis Examples provided below.

Accordingly, another aspect of embodiments provides an organic light-emitting device that includes:

a first electrode;

a second electrode; and

an organic layer that is disposed between the first electrode and the second electrode,

wherein the organic layer includes an emission layer and at least one condensed cyclic compound represented by Formula 1.

The condensed cyclic compound represented by Formula 1 may be used in the organic layer of the organic light-emitting device. For example, the condensed cyclic compound represented by Formula 1 may be used as a host in the emission layer of the organic layer. However, embodiments are not limited thereto.

The organic light-emitting device may have, due to the inclusion of an organic layer including the condensed cyclic compound represented by Formula 1, low driving voltage, high efficiency, high brightness, and long lifespan.

The condensed cyclic compound of Formula 1 may be used between a pair of electrodes of an organic light-emitting device. For example, the condensed cyclic compound represented by Formula 1 may be included in the emission layer. In this regard, the condensed cyclic compound may be a host, and the emission layer may further include a dopant (that is, an amount of the condensed cyclic compound represented by Formula 1 may be greater than an amount of the dopant). The emission layer may be a green emission layer emitting green light or a blue emission layer emitting blue light, and the dopant may be a phosphorescent dopant.

The expression that “(an organic layer) includes at least one condensed cyclic compound” used herein may include a case in which “(an organic layer) includes identical compounds represented by Formula 1 and a case in which (an organic layer) includes two or more different condensed cyclic compounds represented by Formula 1.

For example, the organic layer may include, as the condensed cyclic compound, only Compound 1. In this regard, Compound 1 may be situated in an emission layer of the organic light-emitting device. In some embodiments, the organic layer may include, as the condensed cyclic compound, Compound 1 and Compound 2. In this regard, Compound 1 and Compound 2 may be situated in an identical layer (for example, Compound 1 and Compound 2 all may be situated in an emission layer).

The first electrode may be an anode, which is a hole injection electrode, and the second electrode may be a cathode, which is an electron injection electrode, or the first electrode may be a cathode, which is an electron injection electrode, or the second electrode may be an anode, which is a hole injection electrode.

For example, the first electrode is an anode, and the second electrode may be a cathode, and the organic layer may include:

i) a hole transport region that is disposed between the first electrode and the emission layer, wherein the hole transport region includes at least one of a hole injection layer, a hole transport layer, and an electron blocking layer, and

ii) an electron transport region that is disposed between the emission layer and the second electrode, wherein the electron transport region includes at least one layer selected from a hole blocking layer, an electron transport layer, and an electron injection layer.

The term “organic layer” used herein refers to a single layer and/or a plurality of layers disposed between the first electrode and the second electrode of an organic light-emitting device. The “organic layer” may include, in addition to an organic compound, an organometallic complex including metal.

FIG. 1 is a schematic view of an organic light-emitting device 10 according to an embodiment. Hereinafter, the structure of an organic light-emitting device according to an embodiment and a method of manufacturing an organic light-emitting device according to an embodiment will be described in connection with FIG. 1. The organic light-emitting device 10 includes a first electrode 11, an organic layer 15, and a second electrode 19, which are sequentially stacked.

In FIG. 1, a substrate may be additionally disposed under the first electrode 11 or above the second electrode 19. For use as the substrate, any substrate that is used in general organic light-emitting devices may be used, and the substrate may be a glass substrate or transparent plastic substrate, each with excellent mechanical strength, thermal stability, transparency, surface smoothness, ease of handling, and water-proofness.

The first electrode 11 may be formed by depositing or sputtering a material for forming the first electrode on the substrate. The first electrode 11 may be an anode. The material for the first electrode 11 may be selected from materials with a high work function to allow holes be easily provided. The first electrode 11 may be a reflective electrode or a transmissive electrode. The material for the first electrode 11 may be an indium tin oxide (ITO), indium zinc oxide (IZO), tin oxide (SnO₂), or zinc oxide (ZnO). In some embodiments, the material for the first electrode 11 may be metal, such as magnesium (Mg), aluminum (Al), aluminum-lithium (Al—Li), calcium (Ca), magnesium-indium (Mg—In), or magnesium-silver (Mg—Ag).

The first electrode 11 may have a single-layer structure or a multi-layer structure including two or more layers. For example, the first electrode 11 may have a three-layered structure of ITO/Ag/ITO, but the structure of the first electrode 110 is not limited thereto.

An organic layer 15 is disposed on the first electrode 11.

The organic layer 15 may include a hole transport region, an emission layer, and an electron transport region.

The hole transport region may be disposed between the first electrode 11 and the emission layer.

The hole transport region may include at least one of a hole injection layer, a hole transport layer, an electron blocking layer, and a buffer layer.

The hole transport region may include only either a hole injection layer or a hole transport layer. In some embodiments, the hole transport region may have a structure of hole injection layer/hole transport layer or hole injection layer/hole transport layer/electron blocking layer, which are sequentially stacked in this stated order from the first electrode 11.

When the hole transport region includes a hole injection layer (HIL), the hole injection layer may be formed on the first electrode 11 by using any one of various methods, for example, vacuum deposition, spin coating, casting, or Langmuir-Blodgett (LB) deposition.

When a hole injection layer is formed by vacuum deposition, the deposition conditions may vary depending on a material that is used to form the hole injection layer, and the structure and thermal characteristics of the hole injection layer. For example, the deposition conditions may include a deposition temperature of about 100 to about 500° C., a vacuum pressure of about 10⁻⁸ to about 10⁻³ torr, and a deposition rate of about 0.01 to about 100 Angstroms per second (Å/sec). However, the deposition conditions are not limited thereto.

When the hole injection layer is formed using spin coating, coating conditions may vary depending on the material used to form the hole injection layer, and the structure and thermal properties of the hole injection layer. For example, a coating speed may be from about 2,000 revolutions per minute (rpm) to about 5,000 rpm, and a temperature at which a heat treatment is performed to remove a solvent after coating may be from about 80° C. to about 200° C. However, the coating conditions are not limited thereto.

Conditions for a hole transport layer and an electron blocking layer may be understood by referring to conditions for forming the hole injection layer.

The hole transport region may include at least one selected from m-MTDATA, TDATA, 2-TNATA, NPB, β-NPB, TPD, Spiro-TPD, Spiro-NPB, α-NPB, TAPC, HMTPD, 4,4′,4″-tris(N-carbazolyl)triphenylamine (TCTA), polyaniline/dodecylbenzenesulfonic acid (Pani/DBSA), poly(3,4-ethylenedioxythiophene)/poly(4-styrenesulfonate) (PEDOT/PSS), polyaniline/camphor sulfonic acid (Pani/CSA), (polyaniline)/poly(4-styrenesulfonate) (PANI/PSS), a compound represented by Formula 201 below, and a compound represented by Formula 202:

Ar₁₀₁ and Ar₁₀₂ in Formula 201 may be each independently selected from

phenylene, pentalenylene, indenylene, naphthylene, azulenylene, heptalenylene, acenaphthylene, fluorenylene, pentalenylene, phenanthrenylene, anthracenylene, fluoranthenylene, triphenylenylene, pyrenylene, chrysenylenylene, naphthacenylene, picenylene, perylenylene, and pentacenylene; and

a phenylene, a pentalenylene, an indenylene, a naphthylene, an azulenylene, a heptalenylene, an acenaphthylene, a fluorenylene, a pentalenylene, a phenanthrenylene, an anthracenylene, a fluoranthenylene, a triphenylenylene, a pyrenylene, a chrysenylenylene, a naphthacenylene, a picenylene, a perylenylene, and a pentacenylene, each substituted with at least one selected from a deuterium, a halogen atom, a hydroxyl group, a cyano group, a nitro group, an amino group, an amidino group, a hydrazine group, a hydrazone group, a carboxylic acid and a salt thereof, a sulfonic acid and a salt thereof, a phosphoric acid and a salt thereof, a C₁-C₆₀ alkyl group, a C₂-C₆₀ alkenyl group, a C₂-C₆₀ alkynyl group, a C₁-C₆₀ alkoxy group, a C₃-C₁₀ cycloalkyl group, a C₃-C₁₀ cycloalkenyl group, a C₁-C₁₀ heterocycloalkyl group, a C₁-C₁₀ heterocycloalkenyl group, a C₆-C₆₀ aryl group, a C₆-C₆₀ aryloxy group, a C₆-C₆₀ arylthio group, a C₁-C₆₀ heteroaryl group, a monovalent non-aromatic condensed polycyclic group, and a monovalent non-aromatic condensed heteropolycyclic group.

xa and xb in Formula 201 may be each independently an integer of 0 to 5, or 0, 1 or 2. For example, xa may be 1 and xb may be 0, but xa and xb are not limited thereto.

R₁₀₁ to R₁₀₈, R₁₁₁ to R₁₁₉, and R₁₂₁ to R₁₂₄ in Formulae 201 and 202 may be each independently selected from

a hydrogen, a deuterium, a halogen atom, a hydroxyl group, a cyano group, a nitro group, an amino group, an amidino group, a hydrazine group, a hydrazone group, a carboxylic acid group or a salt thereof, a sulfonic acid group or a salt thereof, a phosphoric acid group or a salt thereof, a C₁-C₁₀ alkyl (for example, methyl, ethyl, propyl, butyl, pentyl, or hexyl), and a C₁-C₁₀ alkoxy (for example, methoxy, ethoxy, propoxy, butoxy, or pentoxy);

a C₁-C₁₀ alkyl group and a C₁-C₁₀ alkoxy group, each substituted with at least one selected from a deuterium, a halogen atom, a hydroxyl group, a cyano group, a nitro group, an amino group, an amidino group, a hydrazine group, a hydrazone group, a carboxylic acid group or a salt thereof, a sulfonic acid group or a salt thereof, and a phosphoric acid group or a salt thereof;

phenyl, naphthyl, anthracenyl, fluorenyl, and pyrenyl; and

a phenyl, a naphthyl, an anthracenyl, a fluorenyl, and a pyrenyl, each substituted with at least one selected from deuterium, a halogen atom, a hydroxyl group, a cyano group, a nitro group, an amino group, an amidino group, a hydrazine group, a hydrazone group, a carboxylic acid group or a salt thereof, a sulfonic acid group or a salt thereof, a phosphoric acid group or a salt thereof, a C₁-C₁₀ alkyl group, and a C₁-C₁₀ alkoxy group, but they are not limited thereto.

R₁₀₉ in Formula 201 may be one selected from phenyl, naphthyl, anthracenyl, biphenyl, and pyridinyl, each substituted with at least one selected from phenyl, naphthyl, anthracenyl, biphenyl and pyridinyl; and deuterium, a halogen atom, a hydroxyl group, a cyano group, a nitro group, an amino group, an amidino group, a hydrazine group, a hydrazone group, a carboxylic acid group or a salt thereof, a sulfonic acid group or a salt thereof, a phosphoric acid group or a salt thereof, a C₁-C₂₀ alkyl, and a C₁-C₂₀ alkoxy.

According to an embodiment, the compound represented by Formula 201 may be represented by Formula 201A below, but is not limited thereto:

R₁₀₁, ⁸ ₁₁₁, ⁸ ₁₁₂, and R₁₀₉ in Formula 201A may be understood by referring to the description provided herein.

For example, the compound represented by Formula 201, and the compound represented by Formula 202 may include compounds HT1 to HT20 illustrated below, but are not limited thereto.

A thickness of the hole transport region may be in a range of about 100 Angstroms (Å) to about 10,000 Å, for example, about 100 Å to about 1,000 Å. When the hole transport region includes both a hole injection layer and a hole transport layer, a thickness of the hole injection layer may be in a range of about 100 Å to about 10,000 Å, for example, about 100 Å to about 1,000 Å, and a thickness of the hole transport layer may be in a range of about 50 Å to about 2,000 Å, for example about 100 Å to about 1,500 Å. When the thicknesses of the hole transport region, the hole injection layer, and the hole transport layer are within these ranges, satisfactory hole transporting characteristics may be obtained without a substantial increase in driving voltage.

The hole transport region may further include, in addition to these materials, a charge-generation material for the improvement of conductive properties. The charge-generation material may be homogeneously or non-homogeneously dispersed in the hole transport region.

The charge-generation material may be, for example, a p-dopant. The p-dopant may be one of a quinone derivative, a metal oxide, and a cyano group-containing compound, but is not limited thereto. Non-limiting examples of the p-dopant are a quinone derivative, such as tetracyanoquinonedimethane (TCNQ) or 2,3,5,6-tetrafluoro-tetracyano-1,4-benzoquinonedimethane (F4-TCNQ); a metal oxide, such as a tungsten oxide or a molybdenium oxide; and a cyano group-containing compound, such as Compound HT-D1 below, but embodiments are not limited thereto.

The hole transport region may include a buffer layer.

Also, the buffer layer may compensate for an optical resonance distance according to a wavelength of light emitted from the emission layer, and thus, efficiency of a formed organic light-emitting device may be improved.

Then, an emission layer (EML) may be formed on the hole transport region by vacuum deposition, spin coating, casting, LB deposition, or the like. When the emission layer is formed by vacuum deposition or spin coating, the deposition or coating conditions may be similar to those applied to form the hole injection layer although the deposition or coating conditions may vary according to the material that is used to form the emission layer.

The electron transport region may further include an electron blocking layer. The electron blocking layer may include, for example, mCP, but a material therefor is not limited thereto.

When the organic light-emitting device is a full color organic light-emitting device, the emission layer may be patterned into a red emission layer, a green emission layer, and a blue emission layer. In some embodiments, due to a stack structure including a red emission layer, a green emission layer, and/or a blue emission layer, the emission layer may emit white light.

The emission layer may include the condensed cyclic compound represented by Formula 1. The emission layer may include a dopant. The dopant may be at least one selected from a phosphorescent dopant and a fluorescent dopant.

For example, a host in the emission layer may include the condensed cyclic compound represented by Formula 1.

The dopant in the emission layer may include a phosphorescent dopant that emits light according to a phosphorescent emission mechanism. In detail, the phosphorescent dopant may emit blue light, but embodiments are not limited thereto.

The phosphorescent dopant may include an organometallic compound represented by Formula 401:

wherein in Formula 401,

M may be selected from iridium (Ir), platinum (Pt), osmium (Os), titanium (Ti), zirconium (Zr), hafnium (Hf), europium (Eu), terbium (Tb), and thulium (Tm);

X₄₀₁ to X₄₀₄ may be each independently nitrogen or carbon;

Y₄₀₁ and Y₄₀₂ are linked via a single bond or a double bond, and Y₄₀₃ and Y₄₀₄ are linked via a single bond or a double bond;

A₄₀₁ and A₄₀₂ rings are each independently selected from a benzene, a naphthalene, a fluorene, a spiro-fluorene, an indene, a pyrrole, a thiophene, a furan, an imidazole, a pyrazole, a thiazole, an isothiazole, an oxazole, an isoxazole, a pyridine, a pyrazine, a pyrimidine, a pyridazine, a quinoline, an isoquinoline, a benzoquinoline, a quinoxaline, a quinazoline, a carbazole, a benzoimidazole, a benzofuran, a benzothiophene, an isobenzothiophene, a benzoxazole, an isobenzoxazole, a triazole, a tetrazole, an oxadiazole, a triazine, a dibenzofuran, and a dibenzothiophene, and the A₄₀₁ and A₄₀₂ rings are optionally linked to each other through a single bond or an organic linking group;

R₄₀₁ to R₄₀₂ may be each independently a hydrogen, a deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitro group, an amino group, an amidino group, a hydrazine group, a hydrazone group, a carboxylic acid group or a salt thereof, a sulfonic acid group or a salt thereof, a phosphoric acid group or a salt thereof, —SF₅, a substituted or unsubstituted C₁-C₆₀ alkyl group, a substituted or unsubstituted C₂-C₆₀ alkenyl group, a substituted or unsubstituted C₂-C₆₀ alkynyl group, a substituted or unsubstituted C₁-C₆₀ alkoxy group, a substituted or unsubstituted C₃-C₁₀ cycloalkyl group, a substituted or unsubstituted C₁-C₁₀ heterocycloalkyl group, a substituted or unsubstituted C₃-C₁₀ cycloalkenyl group, a substituted or unsubstituted C₁-C₁₀ heterocycloalkenyl group, a substituted or unsubstituted C₆-C₆₀ aryl group, a substituted or unsubstituted C₆-C₆₀ aryloxy group, a substituted or unsubstituted C₆-C₆₀ arylthio group, a substituted or unsubstituted C₁-C₆₀ heteroaryl group, a substituted or unsubstituted monovalent non-aromatic condensed polycyclic group, a substituted or unsubstituted monovalent non-aromatic condensed heteropolycyclic group, —N(Q₁)(Q₂), —Si(Q₃)(Q4)(Q5), or —B(Q₆)(Q₇);

a81 and a82 are each independently an integer of 1 to 5;

L₄₀₁ is an organic ligand;

xc1 is 1, 2, or 3;

xc2 is 0, 1, 2, or 3; and

Q1 to Q7 are each independently selected from a C₁-C₆₀ alkyl group, a C₆-C₆₀ aryl group, a C₁-C₆₀ heteroaryl group, a monovalent non-aromatic condensed polycyclic group, and a monovalent non-aromatic condensed heteropolycyclic group.

L₄₀₁ may be a monovalent, divalent, or trivalent organic ligand. For example, L₄₀₁ may be selected from a halogen ligand (for example, Cl or F), a diketone ligand (for example, acetylacetonate, 1,3-diphenyl-1,3-propanedionate, 2,2,6,6-tetramethyl-3,5-heptanedionate, or hexafluoroacetonate), a carboxylic acid ligand (for example, picolinate, dimethyl-3-pyrazolecarboxylate, or benzoate), a carbon monoxide ligand, an isonitrile ligand, a cyano ligand, and a phosphorous ligand (for example, phosphine, and phosphite), but is not limited thereto.

When A₄₀₁ in Formula 401 has two or more substituents, the substituents of A₄₀₁ may bind to each other to form a saturated or unsaturated ring.

When A₄₀₁ in Formula 402 has two or more substituents, the substituents of A₄₀₂ may bind to each other to form a saturated or unsaturated ring.

When xc1 in Formula 401 is two or more, ligands

in Formula 401 may be identical or different. When xc1 in Formula 401 is two or more, A₄₀₁ and A₄₀₂ may be respectively directly connected to A₄₀₁ and A₄₀₂ of other neighboring ligands with or without a linker, for example, a C₁-C₅ alkylene, or —N(R′)—, (wherein R′ may be a C₁-C₁₀ alkyl group or a C₆-C₂₀ aryl group) or —C(═O)—) therebetween.

The phosphorescent dopant may include at least one of Compounds PD1 to PD74 below, but is not limited thereto:

In some embodiments, the phosphorescent dopant may include PtOEP or Fir 6:

The fluorescent dopant may include at least one selected from DPAVBi, BDAVBi, TBPe, DCM, DCJTB, Coumarin 6, and C545T.

When the emission layer includes a host and a dopant, an amount of the dopant may be in a range of about 0.01 to about 20 parts by weight based on 100 parts by weight of the host, but is not limited thereto.

A thickness of the emission layer may be in a range of about 100 Å to about 1,000 Å, for example, about 200 Å to about 600 Å. When the thickness of the emission layer is within this range, excellent light-emission characteristics may be obtained without a substantial increase in driving voltage.

Then, an electron transport region may be disposed on the emission layer.

The electron transport region may include at least one selected from a hole blocking layer, an electron transport layer, and an electron injection layer.

For example, the electron transport region may have a structure of hole blocking layer/electron transport layer/electron injection layer or a structure of electron transport layer/electron injection layer, but the structure of the electron transport region is not limited thereto. The electron transport layer may have a single-layered structure or a multi-layer structure including two or more different materials.

Conditions for forming the hole blocking layer, the electron transport layer, and the electron injection layer which constitute the electron transport region may be understood by referring to the conditions for forming the hole injection layer.

When the electron transport layer includes a hole blocking layer, the hole blocking layer may include, for example, at least one of BCP, Bphen, and TmPyPB, but embodiments are not limited thereto.

A thickness of the hole blocking layer may be in a range of about 20 Å to about 1,000 Å, for example, about 30 Å to about 300 Å. When the thickness of the hole blocking layer is within these ranges, the hole blocking layer may have excellent hole blocking characteristics without a substantial increase in driving voltage.

The electron transport layer may further include, in addition to the organometallic compound represented by Formula 1, at least one selected from BCP, Bphen, Alq₃, Balq, TAZ, and NTAZ.

In some embodiments, the electron transport layer may include at least one of Compounds ET1, ET2, and ET3, but embodiments are not limited thereto:

A thickness of the electron transport layer may be in a range of about 100 Å to about 1,000 Å, for example, about 150 Å to about 500 Å. When the thickness of the electron transport layer is within the range described above, the electron transport layer may have satisfactory electron transport characteristics without a substantial increase in driving voltage.

Also, the electron transport layer may further include, in addition to the materials described above, a metal-containing material.

The metal-containing material may include a Li complex. The Li complex may include, for example, Compound ET-D1 (lithium quinolate, LiQ) or ET-D2.

The electron transport region may include an electron injection layer (EIL) that allows electrons to be easily provided from a second electrode 19.

The electron injection layer may include at least one selected from, LiF, NaCl, CsF, Li₂O, BaO, and LiQ.

A thickness of the electron injection layer may be in a range of about 1 Å to about 100 Å, for example, about 3 Å to about 90 Å. When the thickness of the electron injection layer is within the range described above, the electron injection layer may have satisfactory electron injection characteristics without a substantial increase in driving voltage.

The second electrode 19 is disposed on the organic layer 15. The second electrode 19 may be a cathode. A material for forming the second electrode 19 may be metal, an alloy, an electrically conductive compound, and a combination thereof, which have a relatively low work function. For example, lithium (Li), magnesium (Mg), aluminum (Al), aluminum-lithium (Al—Li), calcium (Ca), magnesium-indium (Mg—In), or magnesium-silver (Mg—Ag) may be formed as the material for forming the second electrode 19. To manufacture a top emission type light-emitting device, a transmissive electrode formed using ITO or IZO may be used as the second electrode 19.

Hereinbefore, the organic light-emitting device has been described with reference to FIG. 1, but is not limited thereto.

A C₁-C₆₀ alkyl group as used herein refers to a linear or branched aliphatic hydrocarbon monovalent group having 1 to 60 carbon atoms. Detailed examples thereof are a methyl group, an ethyl group, a propyl group, an isobutyl group, a sec-butyl group, a tert-butyl group, a pentyl group, an iso-amyl group, and a hexyl group. A C₁-C₆₀ alkylene group as used herein refers to a divalent group having the same structure as the C₁-C₆₀ alkyl group.

A C₁-C₆₀ alkoxy group as used herein refers to a monovalent group represented by —OA₁₀₁ (wherein A₁₀₁ is the C₁-C₆₀ alkyl group). Detailed examples thereof are a methoxy group, an ethoxy group, and an isopropyloxy group.

A C₂-C₆₀ alkenyl group as used herein refers to a hydrocarbon group formed by substituting at least one carbon double bond in the middle or at the terminal of the C₂-C₆₀ alkyl group. Detailed examples thereof are an ethenyl group, a propenyl group, and a butenyl group. A C₂-C₆₀ alkenylene group as used herein refers to a divalent group having the same structure as the C₂-C₆₀ alkenyl group.

A C₂-C₆₀ alkynyl group as used herein refers to a hydrocarbon group formed by substituting at least one carbon triple bond in the middle or at the terminal of the C₂-C₆₀ alkyl group. Detailed examples thereof are an ethynyl group, and a propynyl group. A C₂-C₆₀ alkynylene group as used herein refers to a divalent group having the same structure as the C₂-C₆₀ alkynyl group.

A C₃-C₁₀ cycloalkyl group as used herein refers to a monovalent hydrocarbon monocyclic group having 3 to 10 carbon atoms. Detailed examples thereof are a cyclopropyl group, a cyclobutyl group, a cyclopentyl group, a cyclohexyl group, and a cycloheptyl group. A C₃-C₁₀ cycloalkylene group as used herein refers to a divalent group having the same structure as the C₃-C₁₀ cycloalkyl group.

A C₁-C₁₀ heterocycloalkyl group as used herein refers to a monovalent mono cyclic group having at least one hetero atom selected from N, O, P, and S as a ring-forming atom and 1 to 10 carbon atoms. Detailed examples thereof are a tetrahydrofuranyl group, and a tetrahydrothiophenyl group. A C₁-C₁₀ heterocycloalkylene group as used herein refers to a divalent group having the same structure as the C₁-C₁₀ heterocycloalkyl group.

A C₃-C₁₀ cycloalkenyl group as used herein refers to a monovalent monocyclic group that has 3 to 10 carbon atoms and at least one double bond in the ring thereof, which is not aromatic. Detailed examples thereof are a cyclopentenyl group, a cyclohexenyl group, and a cycloheptenyl group. A C₃-C₁₀ cycloalkenylene group as used herein refers to a divalent group having the same structure as the C₃-C₁₀ cycloalkenyl group.

A C₁-C₁₀ heterocycloalkenyl group as used herein refers to a monovalent monocyclic group that has at least one hetero atom selected from N, O, P, and S as a ring-forming atom, 1 to 10 carbon atoms, and at least one double bond in its ring. Detailed examples of the C₁-C₁₀ heterocycloalkenyl group are a 2,3-dihydrofuranyl group and a 2,3-dihydrothiophenyl group. A C₁-C₁₀ heterocycloalkenylene group as used herein refers to a divalent group having the same structure as the C₁-C₁₀ heterocycloalkenyl group.

A C₆-C₆₀ aryl group as used herein refers to a monovalent group having a carbocyclic aromatic system having 6 to 60 carbon atoms, and a C₆-C₆₀ arylene group as used herein refers to a divalent group having a carbocyclic aromatic system having 6 to 60 carbon atoms. Detailed examples of the C₆-C₆₀ aryl group are a phenyl group, a naphthyl group, an anthracenyl group, a phenanthrenyl group, a pyrenyl group, and a chrysenyl group. When the C₆-C₆₀ aryl group and the C₆-C₆₀ arylene group each include two or more rings, the rings may be fused to each other.

A C₁-C₆₀ heteroaryl group as used herein refers to a monovalent group having a carbocyclic aromatic system that has at least one hetero atom selected from N, O, P, and S as a ring-forming atom, and 1 to 60 carbon atoms. A C₁-C₆₀ heteroarylene group as used herein refers to a divalent group having a carbocyclic aromatic system that has at least one hetero atom selected from N, O, P, and S as a ring-forming atom, and 1 to 60 carbon atoms. Examples of the C₁-C₆₀ heteroaryl group are a pyridinyl group, a pyrimidinyl group, a pyrazinyl group, a pyridazinyl group, a triazinyl group, a quinolinyl group, and an isoquinolinyl group. When the C₁-C₆₀ heteroaryl group and the C₁-C₆₀ heteroarylene group each include two or more rings, the rings may be fused to each other.

A C₆-C₆₀ aryloxy group as used herein indicates —OA₁₀₂ (wherein A₁₀₂ is the C₆-C₆₀ aryl group), and a C₆-C₆₀ arylthio group indicates —SA₁₀₃ (wherein A₁₀₃ is the C₆-C₆₀ aryl group).

A monovalent non-aromatic condensed polycyclic group as used herein refers to a monovalent group that has two or more rings condensed to each other, only carbon atoms (for example, the number of carbon atoms may be in a range of 8 to 60) as a ring forming atom, and which is non-aromatic. An example of the monovalent non-aromatic condensed polycyclic group is a fluorenyl group. A divalent non-aromatic condensed polycyclic group as used herein refers to a divalent group having the same structure as the monovalent non-aromatic condensed polycyclic group.

A monovalent non-aromatic condensed heteropolycyclic group as used herein refers to a monovalent group that has two or more rings condensed to each other, has a heteroatom selected from N, O, P, and S, other than carbon atoms (for example, the number of carbon atoms may be in a range of 2 to 60), as a ring forming atom, and which is non-aromatic. An example of the monovalent non-aromatic condensed heteropolycyclic group is a carbazolyl group. A divalent non-aromatic condensed heteropolycyclic group as used herein refers to a divalent group having the same structure as the monovalent non-aromatic condensed heteropolycyclic group.

A “biphenyl group” as used herein refers to a “phenyl group substituted with a phenyl group.

Hereinafter, a compound and an organic light-emitting device according to embodiments are described in detail with reference to Synthesis Example and Examples. However, the organic light-emitting device is not limited thereto. The phrase “‘B’ was used instead of ‘A’ ” used in describing Synthesis Examples means that a molar equivalent of ‘A’ was identical to a molar equivalent of ‘B’.

EXAMPLE Synthesis Example 1 Synthesis of Compound 2 (1) Synthesis of Intermediate 53-1

3,5-dibromo-4H-1,2,4-triazole (10.00 g, 1 eq.), a phenylboronic acid (11.82 g, 2.2 eq.), a palladium catalyst (2.54 g, 0.05 mol %), and tetrahydrofuran were added to a flask. Potassium carbonate (12.19 g) was subsequently added, and the result was stirred at a temperature of 100° C. under reflux. When the reaction was completed, a reaction product was cooled, and 500 mL of methanol was added thereto to form a precipitate. The precipitate was filtered, and re-crystallized by using hexane to obtain 6.83 g (yield: 70%) of Intermediate 53-1 which had yellow color.

(2) Synthesis of Intermediate 53-2

9-(3-bromophenyl)-9H-carbazole (1.95 g, 1.5 eq.) and 3-bromo-carbazole(1.00 g, 1 eq.) were added to a flask, a copper catalyst (0.52 g, 2 eq.), 4 eq. of potassium carbonate (2.24 g), dibenzo-18-crown-6 (0.14 g, 0.1 eq.), and xylene were added thereto, and the result was stirred at a temperature of 140° C. under reflux. When the reaction was complete, the reaction mixture was cooled and filtered to remove copper therefrom. A solvent was removed from the remaining solution, and the result was purified by column chromatography using methylene chloride and hexane as an eluent to obtain Intermediate 53-2 (1.43 g) in the yield of 72%.

(3) Synthesis of Compound 53

20 g of Intermediate 53-2, 11 g of Intermediate 53-1, 0.294 g of copper oxide, 18.718 g of cesium carbonate, 1.479 g of a ligand, 10 g of PEG, and DMF were added into a flask, and then the mixture was stirred at a temperature of 150° C. while refluxing. When the reaction was complete, a reaction product was cooled, and methanol was added thereto to form a precipitate. The precipitate was filtered, the filtered precipitate was completely dissolved in toluene while heating, and the resultant solution was filtered via a filter. A solvent was removed from the remaining solution, and the result was re-crystallized by using methylene chloride and hexane to obtain Compound 53 (13 g, yield: 50%), which was a white solid. Compound 53 was confirmed by LC-MS.

LC-Mass (calculated: 627.75 g/mol. found: M+H=628 g/mol).

Synthesis Example 2 Synthesis of Compound 55 (1) Synthesis of Intermediate 55-1

Intermediate 55-1 (13.5 g, yield: 80%) was obtained in the same manner as used to synthesize Intermediate 53-1, except that 4,5-dibromo-1H-1,2,3-triazole was used instead of 3,5-dibromo-4H-1,2,4-triazole.

(2) Synthesis of Compound 55

Compound 55 (8.12 g, 32%) was obtained in the same manner as in synthesizing Compound 53, except that Intermediate 55-1 was used instead of Intermediate 53-1. Compound 55 was confirmed by LC-MS.

LC-Mass (calculated: 627.75 g/mol. found: M+H=628 g/mol).

Evaluation Example 1 Evaluation on HOMO, LUMO, and Triplets (T1) Energy Levels

HOMO, LUMO and T1 energy levels of Compounds 53, 55, and A were evaluated according to the method indicated in Table 2, and results thereof are shown in Table 3.

TABLE 2 HOMO A potential (Volts, V)-current (Amperes, A) graph of each energy level compound was obtained by using cyclic voltammetry (CV) evaluation (electrolyte: 0.1 molar (M) tetrabutylammonium perchlorate/ method solvent: acetonitrile/electrode: 3 electrode system (working electrode: carbon, reference electrode: Ag/AgCl, auxiliary electrode: Pt)). From reduction onset of the graph, a HOMO energy level of the compound was calculated. LUMO Each compound was diluted at a concentration of 1 × 10⁻⁵M energy level in tetrahydrofuran (THF), and an UV absorption spectrum evaluation thereof was measured at room temperature by using a method Shimadzu UV-350 spectrometer. The LUMO energy level thereof was calculated by using an optical band gap (Eg) from an edge of the absorption spectrum. T1 Each compound was diluted at a concentration of 1 × 10⁻⁵M energy level by using THF, and loaded into a quartz cell. The resultant evaluation quartz cell was loaded into liquid nitrogen (77 Kelvins (K)) method and a photoluminescence spectrum thereof was measured by using a device for measuring photoluminescence. The obtained spectrum was compared with a photoluminescence spectrum measured at room temperature, and peaks observed only at low temperature were analyzed to calculate T1 energy levels.

TABLE 3 Compound HOMO (eV) LUMO (eV) T1 energy No. (calc.) (calc.) level (eV) A −5.73 −2.17 3.00 53 −5.67 −2.16 3.00 55 −5.68 −2.28 2.82

From Table 3, it is confirmed that the compounds above have electric characteristics that are suitable for use as a material for forming an organic light-emitting device.

Evaluation Example 2 Thermal Characteristics Evaluation

Thermal analysis (N₂ atmosphere, temperature range: from room temperature to 800° C. (10° C./min)-TGA, from room temperature to 400° C.-DSC, Pan Type: Pt Pan in disposable Al Pan(TGA), and disposable Al pan(DSC)) was performed on Compounds 53, 55, and A by using thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC), and results thereof are shown in Table 4. FIGS. 2 and 5 show thermal analysis results of Compounds 53 and 55. Referring to Table 4, and FIGS. 2-5, it was confirmed that the compounds had excellent thermal stability.

TABLE 4 Compound No. Tg (° C.) Td (° C.) A  85 — 53 126 275 55 120 285

Example 1

ITO glass substrate (ITO layer acts as an anode) having a surface resistance of 15 Ohms per square centimeter (Q/cm²) was cut to a size of 50 millimeters (mm)×50 mm×0.7 mm, sonicated with acetone, isopropyl alcohol, and pure water, for 15 minutes in each solvent, and cleaned with UV ozone for 30 minutes.

On the ITO anode, NPB was deposited at a vacuum of 650×10⁻⁷ Pascals (Pa) and at a deposition speed of 0.1 to 0.3 nanometers per second (nm/s) to form a hole injection layer having a thickness of 700 Å, and mCP was deposited on the hole injection layer to form an electron blocking layer having a thickness of 50 Å to form a hole transport region.

On the hole transport region, Compound 53 (host) and compound Flr6 (dopant, 10 wt %) were co-deposited to form an emission layer having a thickness of 300 Å.

TmPyPB was vacuum-deposited on the emission layer to form a hole blocking layer having a thickness of 300 Å, Alq₃ was vacuum-deposited on the hole blocking layer to form an electron transport layer having a thickness of 100 Å, and LiQ was deposited on the electron transport layer to form an electron injection layer having a thickness of 5 Å, and an Al second electrode (cathode) having a thickness of 1,000 Å was formed on the electron injection layer to complete manufacturing of an organic light-emitting device.

Example 2

An organic light-emitting device was manufactured in the same manner as in Example 1, except that in forming an emission layer, as a host, Compound 55 was used instead of Compound 53.

Comparative Example 1

An organic light-emitting device was manufactured in the same manner as in Example 53, except that in forming an emission layer, as a host, Compound A was used instead of Compound 1.

Evaluation Example 3 Evaluation on Characteristics of Organic Light-Emitting Devices

The driving voltage, current efficiency, power efficiency, and lifespan of the organic light-emitting devices manufactured according to Examples 1, 2, and Comparative Example 1 were measured by using a current-voltage meter (Keithley 2400) and a brightness meter (Minolta Cs-1000A). Results thereof are shown in Table 5.

In Table 5, T₉₅ (at 500 candelas per square meter (cd/m²)) indicates lifespan data evaluated by measuring the amount of time that elapsed until brightness was reduced to 95% of the initial brightness of 100%.

In Table 5, the driving voltage, current density, quantum efficiency, and lifespan (T₉₅) of the organic light-emitting devices of Examples 1 and 2 are values relative to the driving voltage, current density, quantum efficiency, and lifespan (T₉₅) of the organic light-emitting device of Comparative Example 1. The driving voltage, current density, quantum efficiency, and lifespan (T₉₅) of the organic light-emitting device of Comparative Example 1 were regarded as “100.”

TABLE 5 Driving Current lifespan voltage density Quantum (T₉₅) (relative (relative efficiency (relative Emission Host value) value) (relative value) value) color Example 1 Compound 88 175 124 161 Blue 53 Example 2 Compound 96 148 101 108 Blue 55 Comparative Compound A 100 100 100 100 Blue Example 1

The condensed cyclic compounds according to embodiments have excellent electric characteristics and thermal stability. Accordingly, organic light-emitting devices including the condensed cyclic compounds may have a low driving voltage, high efficiency, high brightness, long lifespan, and high color purity.

It should be understood that the exemplary embodiments described therein should be considered in a descriptive sense only and not for purposes of limitation. Descriptions of features or aspects within each exemplary embodiment should typically be considered as available for other similar features or aspects in other exemplary embodiments.

While one or more exemplary embodiments have been described with reference to the figures, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope as defined by the following claims. 

What is claimed is:
 1. A condensed cyclic compound represented by Formula 1:

wherein in Formula 1, L₁ is selected from a phenylene group, a pyridinylene group, a pyrimidinylene group, and a triazinylene group; X₁ is N or CR₁; X₂ is N or CR₂; X₃ is N or CR₃; X₄ is N or CR₄; X₅ is N or CR₅; X₆ is N or CR₆; X₇ is N or CR₇; X₈ is N or CR₈; X₉ is N or CR₉; X₁₀ is N or CR₁₀; X₁₁ is N or CR₁₁; X₁₂ is N or CR₁₂; X₁₃ is N or CR₁₃; X₁₄ is N or CR₁₄; X₁₅ is N or CR₁₅; X₁₆ is N or CR₁₆; R₁ to R₁₆ are each independently selected from R_(ET), a hydrogen, a deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitro group, an amino group, an amidino group, a hydrazine group, a hydrazone group, a carboxylic acid group or a salt thereof, a sulfonic acid group or a salt thereof, a phosphoric acid group or a salt thereof, a substituted or unsubstituted C₁-C₆₀ alkyl group, a substituted or unsubstituted C₁-C₆₀ alkoxy group, a substituted or unsubstituted C₃-C₁₀ cycloalkyl group, a substituted or unsubstituted C₆-C₆₀ aryl group, a substituted or unsubstituted C₆-C₆₀ aryloxy group, a substituted or unsubstituted C₆-C₆₀ arylthio group, a substituted or unsubstituted C₁-C₆₀ heteroaryl group, a substituted or unsubstituted monovalent non-aromatic condensed polycyclic group, and a substituted or unsubstituted monovalent non-aromatic condensed heteropolycyclic group; at least one selected from X₁ to X₁₆ is CR_(ET); R_(ET) is represented by any one of Formulae 2-1 to 2-8:

wherein in Formulae 2-1 to 2-8, R₂₁ and R₂₂ are each independently selected from a hydrogen, a deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitro group, an amino group, an amidino group, a hydrazine group, a hydrazone group, a carboxylic acid group or a salt thereof, a sulfonic acid group or a salt thereof, a phosphoric acid group or a salt thereof, a substituted or unsubstituted C₁-C₆₀ alkyl group, a substituted or unsubstituted C₁-C₆₀ alkoxy group, a substituted or unsubstituted C₃-C₁₀ cycloalkyl group, a substituted or unsubstituted C₆-C₆₀ aryl group, a substituted or unsubstituted C₆-C₆₀ aryloxy group, a substituted or unsubstituted C₆-C₆₀ arylthio group, a substituted or unsubstituted C₁-C₆₀ heteroaryl group, a substituted or unsubstituted monovalent non-aromatic condensed polycyclic group, and a substituted or unsubstituted monovalent non-aromatic condensed heteropolycyclic group; * indicates a binding site to a neighboring atom, and at least one of substituents of the substituted C₁-C₆₀ alkyl group, substituted C₁-C₆₀ alkoxy group, substituted C₃-C₁₀ cycloalkyl group, substituted C₆-C₆₀ aryl group, substituted C₆-C₆₀ aryloxy group, substituted C₆-C₆₀ arylthio group, substituted C₁-C₆₀ heteroaryl group, substituted monovalent non-aromatic condensed polycyclic group, and substituted monovalent non-aromatic condensed heteropolycyclic group is selected from a deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitro group, an amino group, an amidino group, a hydrazine group, a hydrazone group, a carboxylic acid group or a salt thereof, a sulfonic acid group or a salt thereof, a phosphoric acid group or a salt thereof, a C₁-C₆₀ alkyl group, a C₂-C₆₀ alkenyl group, a C₂-C₆₀ alkynyl group, and a C₁-C₆₀ alkoxy group; a C₁-C₆₀ alkyl group, a C₁-C₆₀ alkenyl group, a C₁-C₆₀ alkynyl group, and a C₁-C₆₀ alkoxy group, each substituted with at least one selected from deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitro group, an amino group, an amidino group, a hydrazine group, a hydrazone group, a carboxylic acid group or a salt thereof, a sulfonic acid group or a salt thereof, a phosphoric acid group or a salt thereof, a C₃-C₁₀ cycloalkyl group, a C₁-C₁₀ heterocycloalkyl group, a C₃-C₁₀ cycloalkenyl group, a C₁-C₁₀ heterocycloalkenyl group, a C₆-C₆₀ aryl group, a C₆-C₆₀ aryloxy group, a C₆-C₆₀ arylthio group, a C₁-C₆₀ heteroaryl group, a monovalent non-aromatic condensed polycyclic group, a monovalent non-aromatic condensed heteropolycyclic group, and —Si(Q₁₁)(Q₁₂)(Q₁₃); a C₃-C₁₀ cycloalkyl group, a C₁-C₁₀ heterocycloalkyl group, a C₃-C₁₀ cycloalkenyl group, a C₁-C₁₀ heterocycloalkenyl group, a C₆-C₆₀ aryl group, a C₆-C₆₀ aryloxy group, a C₆-C₆₀ arylthio group, a C₁-C₆₀ heteroaryl group, a monovalent non-aromatic condensed polycyclic group, and a monovalent non-aromatic condensed heteropolycyclic group; a C₃-C₁₀ cycloalkyl group, a C₁-C₁₀ heterocycloalkyl group, a C₃-C₁₀ cycloalkenyl group, a C₁-C₁₀ heterocycloalkenyl group, a C₆-C₆₀ aryl group, a C₆-C₆₀ aryloxy group, a C₆-C₆₀ arylthio group, a C₁-C₆₀ heteroaryl group, a monovalent non-aromatic condensed polycyclic group, and a monovalent non-aromatic condensed heteropolycyclic group, each substituted with at least one selected from a deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitro group, an amino group, an amidino group, a hydrazine group, a hydrazone group, a carboxylic acid group or a salt thereof, a sulfonic acid group or a salt thereof, a phosphoric acid group or a salt thereof, a C₁-C₆₀ alkyl group, a C₁-C₆₀ alkenyl group, a C₁-C₆₀ alkynyl group, a C₁-C₆₀ alkoxy group, a C₃-C₁₀ cycloalkyl group, a C₁-C₁₀ heterocycloalkyl group, a C₃-C₁₀ cycloalkenyl group, a C₁-C₁₀ heterocycloalkenyl group, a C₆-C₆₀ aryl group, a C₆-C₆₀ aryloxy group, a C₆-C₆₀ arylthio group, a C₁-C₆₀ heteroaryl group, a monovalent non-aromatic condensed polycyclic group, a monovalent non-aromatic condensed heteropolycyclic group, and —Si(Q₂₁)(Q₂₂)(Q₂₃); and —Si(Q₃₁)(Q₃₂)(Q₃₃), wherein Q₁₁ to Q₁₃, Q₂₁ to Q₂₃ and Q₃₁ to Q₃₃ are each independently selected from a C₁-C₆₀ alkyl group, a C₆-C₆₀ aryl group, a C₁-C₆₀ heteroaryl group, a monovalent non-aromatic condensed polycyclic group, and a monovalent non-aromatic condensed heteropolycyclic group.
 2. The condensed cyclic compound of claim 1, wherein L₁ is selected from Formulae 3-1 to 3-14;

wherein in Formulae 3-1 to 3-14, * and *′ indicate each independently a binding site to a neighboring atom.
 3. The condensed cyclic compound of claim 1, wherein L₁ is selected from Formulae 3-2, 3-5, 3-6, 3-7, 3-11, 3-12, and 3-14:

wherein in Formulae 3-2, 3-5, 3-6, 3-7, 3-11, 3-12, and 3-14, * and *′ indicate each independently a binding site to a neighboring atom.
 4. The condensed cyclic compound of claim 1, wherein X₁ is CR₁X₂ is CR₂; X₃ is CR₃; X₄ is CR₄; X₅ is CR₅; X₆ is CR₆; X₇ is CR₇; X₈ is CR₈; X₉ is CR₉; X₁₀ is CR₁₀; X₁₁ is CR₁₁; X₁₂ is CR₁₂; X₁₃ is CR₁₃; X₁₄ is CR₁₄; X₁₅ is CR₁₅; and X₁₆ is CR₁₈, or X₁ is N; X₂ is CR₂; X₃ is CR₃; X₄ is CR₄; X₅ is CR₅; X₆ is CR₆; X₇ is CR₇; X₈ is CR₈; X₉ is CR₉; X₁₀ is CR₁₀; X₁₁ is CR₁₁; X₁₂ is CR₁₂; X₁₃ is CR₁₃; X₁₄ is CR₁₄; X₁₅ is CR₁₅; and X₁₆ is CR₁₆, or X₁ is CR₁; X₂ is N; X₃ is CR₃; X₄ is CR₄; X₅ is CR₅; X₆ is CR₆; X₇ is CR₇; X₈ is CR₈; X₉ is CR₉; X₁₀ is CR₁₀; X₁₁ is CR₁₁; X₁₂ is CR₁₂; X₁₃ is CR₁₃; X₁₄ is CR₁₄; X₁₅ is CR₁₅; and X₁₆ is CR₁₆, or X₁ is N; X₂ is CR₂; X₃ is CR₃; X₄ is CR₄; X₅ is CR₅; X₆ is CR₆; X₇ is CR₇; X₈ is N; X₉ is CR₉; X₁₀ is CR₁₀; X₁₁ is CR₁₁; X₁₂ is CR₁₂; X₁₃ is CR₁₃; X₁₄ is CR₁₄; X₁₅ is CR₁₅; and X₁₆ is CR₁₆, or X₁ is CR₁; X₂ is N; X₃ is CR₃; X₄ is CR₄; X₅ is CR₅; X₆ is CR₆; X₇ is N; X₈ is CR₈; X₉ is CR₉; X₁₀ is CR₁₀; X₁₁ is CR₁₁; X₁₂ is CR₁₂; X₁₃ is CR₁₃; X₁₄ is CR₁₄; X₁₅ is CR₁₅; and X₁₆ is CR₁₆.
 5. The condensed cyclic compound of claim 1, wherein R₁ to R₁₆ in Formula 1 are each independently selected from R_(ET), a hydrogen, a deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitro group, a methyl group, an ethyl group, an n-propyl group, an iso-propyl group, an n-butyl group, an iso-butyl group, a sec-butyl group, a tert-butyl group, an n-pentyl group, an n-hexyl group, a methoxy group, an ethoxy group, an n-propoxy group, an iso-propoxy group, an n-butoxy group, a tert-butoxy group, a cyclopentyl group, a cyclohexyl group, a phenyl group, a pentalenyl group, an indenyl group, a naphthyl group, an azulenyl group, a heptalenyl group, an indacenyl group, an acenaphthyl group, a fluorenyl group, a spiro-fluorenyl group, a benzofluorenyl group, a dibenzofluorenyl group, a phenalenyl group, a phenanthrenyl group, an anthracenyl group, a fluoranthenyl group, a triphenylenyl group, a pyrenyl group, a chrysenyl group, a naphthacenyl group, a picenyl group, a perylenyl group, a pentaphenyl group, a hexacenyl group, a pentacenyl group, a rubicenyl group, a coronenyl group, an ovalenyl group, a pyrrolyl group, a thiophenyl group, a furanyl group, an imidazolyl group, a pyrazolyl group, a thiazolyl group, an isothiazolyl group, an oxazolyl group, an isoxazolyl group, a pyridinyl group, a pyrazinyl group, a pyrimidinyl group, a pyridazinyl group, an isoindolyl group, an indolyl group, an indazolyl group, a purinyl group, a quinolinyl group, an isoquinolinyl group, a benzoquinolinyl group, a phthalazinyl group, a naphthyridinyl group, a quinoxalinyl group, a quinazolinyl group, a cinnolinyl group, a carbazolyl group, a phenanthridinyl group, an acridinyl group, a phenanthrolinyl group, a phenazinyl group, a benzoimidazolyl group, a benzofuranyl group, a benzothiophenyl group, an isobenzothiazolyl group, a benzoxazolyl group, an isobenzoxazolyl group, a triazolyl group, a tetrazolyl group, an oxadiazolyl group, a triazinyl group, a dibenzofuranyl group, a dibenzothiophenyl group, a benzocarbazolyl group, and a dibenzocarbazolyl group; and a methyl group, an ethyl group, an n-propyl group, an iso-propyl group, an n-butyl group, an iso-butyl group, a sec-butyl group, a tert-butyl group, an n-pentyl group, an n-hexyl group, a methoxy group, an ethoxy group, an n-propoxy group, an iso-propoxy group, an n-butoxy group, a tert-butoxy group, a cyclopentyl group, a cyclohexyl group, a phenyl group, a pentalenyl group, an indenyl group, a naphthyl group, an azulenyl group, a heptalenyl group, an indacenyl group, an acenaphthyl group, a fluorenyl group, a spiro-fluorenyl group, a benzofluorenyl group, a dibenzofluorenyl group, a phenalenyl group, a phenanthrenyl group, an anthracenyl group, a fluoranthenyl group, a triphenylenyl group, a pyrenyl group, a chrysenyl group, a naphthacenyl group, a picenyl group, a perylenyl group, a pentaphenyl group, a hexacenyl group, a pentacenyl group, a rubicenyl group, a coronenyl group, an ovalenyl group, a pyrrolyl group, a thiophenyl group, a furanyl group, an imidazolyl group, a pyrazolyl group, a thiazolyl group, an isothiazolyl group, an oxazolyl group, an isoxazolyl group, a pyridinyl group, a pyrazinyl group, a pyrimidinyl group, a pyridazinyl group, an isoindolyl group, an indolyl group, an indazolyl group, a purinyl group, a quinolinyl group, an isoquinolinyl group, a benzoquinolinyl group, a phthalazinyl group, a naphthyridinyl group, a quinoxalinyl group, a quinazolinyl group, a cinnolinyl group, a carbazolyl group, a phenanthridinyl group, an acridinyl group, a phenanthrolinyl group, a phenazinyl group, a benzoimidazolyl group, a benzofuranyl group, a benzothiophenyl group, an isobenzothiazolyl group, a benzoxazolyl group, an isobenzoxazolyl group, a triazolyl group, a tetrazolyl group, an oxadiazolyl group, a triazinyl group, a dibenzofuranyl group, a dibenzothiophenyl group, a benzocarbazolyl group and a dibenzocarbazolyl group, each substituted with at least one selected from a deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitro group, an amino group, an amidino group, a hydrazine group, a hydrazone group, a carboxylic acid group or a salt thereof, a sulfonic acid group or a salt thereof, a phosphoric acid group or a salt thereof, a C₁-C₂₀ alkyl group, a C₁-C₂₀ alkoxy group, a cyclopentyl group, a cyclohexyl group, a cycloheptyl group, a cyclopentenyl group, a cyclohexenyl group, a phenyl group, a pentalenyl group, an indenyl group, a naphthyl group, an azulenyl group, a heptalenyl group, an indacenyl group, an acenaphthyl group, a fluorenyl group, a spiro-fluorenyl group, a benzofluorenyl group, a dibenzofluorenyl group, a phenalenyl group, a phenanthrenyl group, an anthracenyl group, a fluoranthenyl group, a triphenylenyl group, a pyrenyl group, a chrysenyl group, a naphthacenyl group, a picenyl group, a perylenyl group, a pentaphenyl group, a hexacenyl group, a pentacenyl group, a rubicenyl group, a coronenyl group, an ovalenyl group, a pyrrolyl group, a thiophenyl group, a furanyl group, an imidazolyl group, a pyrazolyl group, a thiazolyl group, an isothiazolyl group, an oxazolyl group, an isoxazolyl group, a pyridinyl group, a pyrazinyl group, a pyrimidinyl group, a pyridazinyl group, an isoindolyl group, an indolyl group, an indazolyl group, a purinyl group, a quinolinyl group, an isoquinolinyl group, a benzoquinolinyl group, a phthalazinyl group, a naphthyridinyl group, a quinoxalinyl group, a quinazolinyl group, a cinnolinyl group, a carbazolyl group, a phenanthridinyl group, an acridinyl group, a phenanthrolinyl group, a phenazinyl group, a benzoimidazolyl group, a benzofuranyl group, a benzothiophenyl group, an isobenzothiazolyl group, a benzoxazolyl group, an isobenzoxazolyl group, a triazolyl group, a tetrazolyl group, an oxadiazolyl group, a triazinyl group, a dibenzofuranyl group, a dibenzothiophenyl group, a benzocarbazolyl group, and a dibenzocarbazolyl group.
 6. The condensed cyclic compound of claim 1, wherein R₁ to R₁₆ are each independently selected from R_(ET), a hydrogen, a deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitro group, a methyl group, an ethyl group, an n-propyl group, an iso-propyl group, an n-butyl group, an iso-butyl group, a sec-butyl group, a tert-butyl group, a phenyl group, a naphthyl group, a fluorenyl group, an anthracenyl group, a triphenylenyl group, a pyrrolyl group, a thiophenyl group, a furanyl group, a pyridinyl group, a pyrimidinyl group, a pyridazinyl group, an indolyl group, a quinolinyl group, an isoquinolinyl group, a carbazolyl group, a benzofuranyl group, a benzothiophenyl group, a triazolyl group, a triazinyl group, a dibenzofuranyl group, and a dibenzothiophenyl group; and a phenyl group, a naphthyl group, a fluorenyl group, an anthracenyl group, a triphenylenyl group, a pyrrolyl group, a thiophenyl group, a furanyl group, a pyridinyl group, a pyrimidinyl group, a pyridazinyl group, an indolyl group, a quinolinyl group, an isoquinolinyl group, a carbazolyl group, a benzofuranyl group, a benzothiophenyl group, a triazolyl group, a triazinyl group, a dibenzofuranyl group and a dibenzothiophenyl group, each substituted with at least one selected from a deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitro group, a C₁-C₂₀ alkyl group, a phenyl group, a naphthyl group, a pyridinyl group, a pyrimidinyl group, and a triazinyl group.
 7. The condensed cyclic compound of claim 1, wherein one or two selected from X₁ to X₁₆ are CR_(ET).
 8. The condensed cyclic compound of claim 1, wherein one selected from X₁ to X₁₆ is R_(ET).
 9. The condensed cyclic compound of claim 1, wherein X₁₄ is CR_(ET).
 10. The condensed cyclic compound of claim 1, wherein R_(ET) is a group represented by any one of Formulae 2-1, 2-3, 2-4, and 2-6.
 11. The condensed cyclic compound of claim 1, wherein R₂₁ and R₂₂ are each independently selected from a hydrogen, a deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitro group, a methyl group, an ethyl group, an n-propyl group, an iso-propyl group, an n-butyl group, an iso-butyl group, a sec-butyl group, a tert-butyl group, an n-pentyl group, an n-hexyl group, a methoxy group, an ethoxy group, an n-propoxy group, an iso-propoxy group, an n-butoxy group, a tert-butoxy group, a cyclopentyl group, a cyclohexyl group, a phenyl group, a pentalenyl group, an indenyl group, a naphthyl group, an azulenyl group, a heptalenyl group, an indacenyl group, an acenaphthyl group, a fluorenyl group, a spiro-fluorenyl group, a benzofluorenyl group, a dibenzofluorenyl group, a phenalenyl group, a phenanthrenyl group, an anthracenyl group, a fluoranthenyl group, a triphenylenyl group, a pyrenyl group, a chrysenyl group, a naphthacenyl group, a picenyl group, a perylenyl group, a pentaphenyl group, a hexacenyl group, a pentacenyl group, a rubicenyl group, a coronenyl group, an ovalenyl group, a pyrrolyl group, a thiophenyl group, a furanyl group, an imidazolyl group, a pyrazolyl group, a thiazolyl group, an isothiazolyl group, an oxazolyl group, an isoxazolyl group, a pyridinyl group, a pyrazinyl group, a pyrimidinyl group, a pyridazinyl group, an isoindolyl group, an indolyl group, an indazolyl group, a purinyl group, a quinolinyl group, an isoquinolinyl group, a benzoquinolinyl group, a phthalazinyl group, a naphthyridinyl group, a quinoxalinyl group, a quinazolinyl group, a cinnolinyl group, a carbazolyl group, a phenanthridinyl group, an acridinyl group, a phenanthrolinyl group, a phenazinyl group, a benzoimidazolyl group, a benzofuranyl group, a benzothiophenyl group, an isobenzothiazolyl group, a benzoxazolyl group, an isobenzoxazolyl group, a triazolyl group, a tetrazolyl group, an oxadiazolyl group, a triazinyl group, a dibenzofuranyl group, a dibenzothiophenyl group, a benzocarbazolyl group, and a dibenzocarbazolyl group; and a methyl group, an ethyl group, an n-propyl group, an iso-propyl group, an n-butyl group, an iso-butyl group, a sec-butyl group, a tert-butyl group, an n-pentyl group, an n-hexyl group, a methoxy group, an ethoxy group, an n-propoxy group, an iso-propoxy group, an n-butoxy group, a tert-butoxy group, a cyclopentyl group, a cyclohexyl group, a phenyl group, a pentalenyl group, an indenyl group, a naphthyl group, an azulenyl group, a heptalenyl group, an indacenyl group, an acenaphthyl group, a fluorenyl group, a spiro-fluorenyl group, a benzofluorenyl group, a dibenzofluorenyl group, a phenalenyl group, a phenanthrenyl group, an anthracenyl group, a fluoranthenyl group, a triphenylenyl group, a pyrenyl group, a chrysenyl group, a naphthacenyl group, a picenyl group, a perylenyl group, a pentaphenyl group, a hexacenyl group, a pentacenyl group, a rubicenyl group, a coronenyl group, an ovalenyl group, a pyrrolyl group, a thiophenyl group, a furanyl group, an imidazolyl group, a pyrazolyl group, a thiazolyl group, an isothiazolyl group, an oxazolyl group, an isoxazolyl group, a pyridinyl group, a pyrazinyl group, a pyrimidinyl group, a pyridazinyl group, an isoindolyl group, an indolyl group, an indazolyl group, a purinyl group, a quinolinyl group, an isoquinolinyl group, a benzoquinolinyl group, a phthalazinyl group, a naphthyridinyl group, a quinoxalinyl group, a quinazolinyl group, a cinnolinyl group, a carbazolyl group, a phenanthridinyl group, an acridinyl group, a phenanthrolinyl group, a phenazinyl group, a benzoimidazolyl group, a benzofuranyl group, a benzothiophenyl group, an isobenzothiazolyl group, a benzoxazolyl group, an isobenzoxazolyl group, a triazolyl group, a tetrazolyl group, an oxadiazolyl group, a triazinyl group, a dibenzofuranyl group, a dibenzothiophenyl group, a benzocarbazolyl group and a dibenzocarbazolyl group, each substituted with at least one selected from a deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitro group, an amino group, an amidino group, a hydrazine group, a hydrazone group, a carboxylic acid group or a salt thereof, a sulfonic acid group or a salt thereof, a phosphoric acid group or a salt thereof, a C₁-C₂₀ alkyl group, a C₁-C₂₀ alkoxy group, a cyclopentyl group, a cyclohexyl group, a cycloheptyl group, a cyclopentenyl group, a cyclohexenyl group, a phenyl group, a pentalenyl group, an indenyl group, a naphthyl group, an azulenyl group, a heptalenyl group, an indacenyl group, an acenaphthyl group, a fluorenyl group, a spiro-fluorenyl group, a benzofluorenyl group, a dibenzofluorenyl group, a phenalenyl group, a phenanthrenyl group, an anthracenyl group, a fluoranthenyl group, a triphenylenyl group, a pyrenyl group, a chrysenyl group, a naphthacenyl group, a picenyl group, a perylenyl group, a pentaphenyl group, a hexacenyl group, a pentacenyl group, a rubicenyl group, a coronenyl group, an ovalenyl group, a pyrrolyl group, a thiophenyl group, a furanyl group, an imidazolyl group, a pyrazolyl group, a thiazolyl group, an isothiazolyl group, an oxazolyl group, an isoxazolyl group, a pyridinyl group, a pyrazinyl group, a pyrimidinyl group, a pyridazinyl group, an isoindolyl group, an indolyl group, an indazolyl group, a purinyl group, a quinolinyl group, an isoquinolinyl group, a benzoquinolinyl group, a phthalazinyl group, a naphthyridinyl group, a quinoxalinyl group, a quinazolinyl group, a cinnolinyl group, a carbazolyl group, a phenanthridinyl group, an acridinyl group, a phenanthrolinyl group, a phenazinyl group, a benzoimidazolyl group, a benzofuranyl group, a benzothiophenyl group, an isobenzothiazolyl group, a benzoxazolyl group, an isobenzoxazolyl group, a triazolyl group, a tetrazolyl group, an oxadiazolyl group, a triazinyl group, a dibenzofuranyl group, a dibenzothiophenyl group, a benzocarbazolyl group, and a dibenzocarbazolyl group.
 12. The condensed cyclic compound of claim 1, wherein R₂₁ and R₂₂ are each independently selected from a hydrogen, a deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitro group, a methyl group, an ethyl group, an n-propyl group, an iso-propyl group, an n-butyl group, an iso-butyl group, a sec-butyl group, a tert-butyl group, an n-pentyl group, an n-hexyl group, and a group represented by Formulae 4-1 to 4-11:

wherein in Formulae 4-1 to 4-11, * indicates a binding site to a neighboring atom.
 13. The condensed cyclic compound of claim 1, wherein R_(ET) is a group represented by any one of Formulae 5-1 to 5-24:

wherein in Formulae 5-1 to 5-24, * indicates a binding site to a neighboring atom.
 14. The condensed cyclic compound of claim 1, wherein the condensed cyclic compound represented by one of Formulae 1A to 1E:

in Formulae 1A to 1E, L₁ is selected from a phenylene group, a pyridinylene group, a pyrimidinylene group, and a triazinylene group; R₁ to R₁₆ are each independently selected from R_(ET), a hydrogen, a deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitro group, a methyl group, an ethyl group, an n-propyl group, an iso-propyl group, an n-butyl group, an iso-butyl group, a sec-butyl group, a tert-butyl group, a phenyl group, a naphthyl group, a fluorenyl group, an anthracenyl group, a triphenylenyl group, a pyrrolyl group, a thiophenyl group, a furanyl group, a pyridinyl group, a pyrimidinyl group, a pyridazinyl group, an indolyl group, a quinolinyl group, an isoquinolinyl group, a carbazolyl group, a benzofuranyl group, a benzothiophenyl group, a triazolyl group, a triazinyl group, a dibenzofuranyl group, and a dibenzothiophenyl group; and a phenyl group, a naphthyl group, a fluorenyl group, an anthracenyl group, a triphenylenyl group, a pyrrolyl group, a thiophenyl group, a furanyl group, a pyridinyl group, a pyrimidinyl group, a pyridazinyl group, an indolyl group, a quinolinyl group, an isoquinolinyl group, a carbazolyl group, a benzofuranyl group, a benzothiophenyl group, a triazolyl group, a triazinyl group, a dibenzofuranyl group and a dibenzothiophenyl group, each substituted with at least one selected from a deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitro group, a C₁-C₂₀ alkyl group, a phenyl group, a naphthyl group, a pyridinyl group, a pyrimidinyl group, and a triazinyl group; at least one selected from R₁ to R₁₆ is R_(ET); R_(ET) is represented by any one of Formulae 2-1 to 2-8:

wherein in Formulae 2-1 to 2-8, R₂₁ and R₂₂ are each independently selected from a hydrogen, a deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitro group, a methyl group, an ethyl group, an n-propyl group, an iso-propyl group, an n-butyl group, an iso-butyl group, a sec-butyl group, a tert-butyl group, an n-pentyl group, an n-hexyl group, a methoxy group, an ethoxy group, an n-propoxy group, an iso-propoxy group, an n-butoxy group, a tert-butoxy group, a cyclopentyl group, a cyclohexyl group, a phenyl group, a naphthyl group, a fluorenyl group, a pyridinyl group, a pyrimidinyl group, a pyridazinyl group, and a triazinyl group; and a phenyl group, a naphthyl group, a fluorenyl group, a pyridinyl group, a pyrimidinyl group, a pyridazinyl group, and a triazinyl group, each substituted with at least one selected from a deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitro group, a C₁-C₂₀ alkyl group, a phenyl group, a naphthyl group, a pyridinyl group, a pyrimidinyl group, and a triazinyl group. * indicates a binding site to a neighboring atom.
 15. The condensed cyclic compound of claim 14, wherein R₁ to R₁₃, R₁₅, and R₁₆ are each independently selected from a hydrogen, a deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitro group, a methyl group, an ethyl group, an n-propyl group, an iso-propyl group, an n-butyl group, an iso-butyl group, a sec-butyl group, a tert-butyl group, a phenyl group, a naphthyl group, a fluorenyl group, an anthracenyl group, a triphenylenyl group, a pyrrolyl group, a thiophenyl group, a furanyl group, a pyridinyl group, a pyrimidinyl group, a pyridazinyl group, an indolyl group, a quinolinyl group, an isoquinolinyl group, a carbazolyl group, a benzofuranyl group, a benzothiophenyl group, a triazolyl group, a triazinyl group, a dibenzofuranyl group, and a dibenzothiophenyl group; and a phenyl group, a naphthyl group, a fluorenyl group, an anthracenyl group, a triphenylenyl group, a pyrrolyl group, a thiophenyl group, a furanyl group, a pyridinyl group, a pyrimidinyl group, a pyridazinyl group, an indolyl group, a quinolinyl group, an isoquinolinyl group, a carbazolyl group, a benzofuranyl group, a benzothiophenyl group, a triazolyl group, a triazinyl group, a dibenzofuranyl group and a dibenzothiophenyl group, each substituted with at least one selected from a deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitro group, a C₁-C₂₀ alkyl group, a phenyl group, a naphthyl group, a pyridinyl group, a pyrimidinyl group, and a triazinyl group; and R₁₄ is R_(ET).
 16. The condensed cyclic compound of claim 1, wherein the condensed cyclic compound is represented by any one of Formulae 1-1 to 1-9:

wherein in Formulae 1-1 to 1-9, L₁ is selected from a phenylene group, a pyridinylene group, a pyrimidinylene group, and a triazinylene group; R₃, R₆, and R₁₄ are each independently selected from R_(ET), a hydrogen, a deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitro group, a methyl group, an ethyl group, an n-propyl group, an iso-propyl group, an n-butyl group, an iso-butyl group, a sec-butyl group, a tert-butyl group, a phenyl group, a naphthyl group, a fluorenyl group, an anthracenyl group, a triphenylenyl group, a pyrrolyl group, a thiophenyl group, a furanyl group, a pyridinyl group, a pyrimidinyl group, a pyridazinyl group, an indolyl group, a quinolinyl group, an isoquinolinyl group, a carbazolyl group, a benzofuranyl group, a benzothiophenyl group, a triazolyl group, a triazinyl group, a dibenzofuranyl group, and a dibenzothiophenyl group; and a phenyl group, a naphthyl group, a fluorenyl group, an anthracenyl group, a triphenylenyl group, a pyrrolyl group, a thiophenyl group, a furanyl group, a pyridinyl group, a pyrimidinyl group, a pyridazinyl group, an indolyl group, a quinolinyl group, an isoquinolinyl group, a carbazolyl group, a benzofuranyl group, a benzothiophenyl group, a triazolyl group, a triazinyl group, a dibenzofuranyl group and a dibenzothiophenyl group, each substituted with at least one selected from a deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitro group, a C₁-C₂₀ alkyl group, a phenyl group, a naphthyl group, a pyridinyl group, a pyrimidinyl group, and a triazinyl group; at least one selected from R₃, R₆, and R₁₄ is R_(ET); R_(ET) is represented by any one of Formulae 2-1 to 2-8:

wherein in Formulae 2-1 to 2-8, R₂₁ and R₂₂ are each independently selected from a hydrogen, a deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitro group, a methyl group, an ethyl group, an n-propyl group, an iso-propyl group, an n-butyl group, an iso-butyl group, a sec-butyl group, a tert-butyl group, an n-pentyl group, an n-hexyl group, a methoxy group, an ethoxy group, an n-propoxy group, an iso-propoxy group, an n-butoxy group, a tert-butoxy group, a cyclopentyl group, a cyclohexyl group, a phenyl group, a naphthyl group, a fluorenyl group, a pyridinyl group, a pyrimidinyl group, a pyridazinyl group, and a triazinyl group; and a phenyl group, a naphthyl group, a fluorenyl group, a pyridinyl group, a pyrimidinyl group, a pyridazinyl group, and a triazinyl group, each substituted with at least one selected from a deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitro group, a C₁-C₂₀ alkyl group, a phenyl group, a naphthyl group, a pyridinyl group, a pyrimidinyl group, and a triazinyl group, and * indicates a binding site to a neighboring atom.
 17. The condensed cyclic compound of claim 1, wherein the condensed cyclic compound is one of Compounds 1 to 107:


18. An organic light-emitting device, comprising: a first electrode; a second electrode; and an organic layer disposed between the first electrode and the second electrode, wherein the organic layer comprises an emission layer and the condensed cyclic compound of claim
 1. 19. The organic light-emitting device of claim 18, wherein the emission layer comprises the condensed cyclic compound of claim
 1. 20. The organic light-emitting device of claim 19, wherein the emission layer further comprises a dopant, and wherein the condensed cyclic compound of claim 1 acts as a host. 